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Bob Smith Industries - BSI-203H BSI-203 Mid-Cure Epoxy (4.5 oz. Combined), Light Amber

4.8 out of 5 stars 746
$13.99
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Purchase options and add-ons

Brand Bob Smith Industries
Material Plastic
Compatible Material Fiberglass
Item Form Oz
Special Feature Water Resistant

About this item

  • Made in the USA
  • 15 minute working time
  • Handle parts in 45 minutes
  • Proud Sponsors of Wounded Warrior Project

Frequently bought together

Bob Smith Industries - BSI-203H BSI-203 Mid-Cure Epoxy (4.5 oz. Combined), Light Amber
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Bob Smith Industries BSI-205 Clear Slow-Cure Epoxy (4.5 oz. Combined)
$13.66
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Bob Smith Industries BSI-201 Quik-Cure Epoxy (4.5 oz. Combined),Clear Clear Original version
$13.99 ($3.11/Ounce)
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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 3 x 1 x 5 inches; 7.2 ounces
  • Manufacturer recommended age ‏ : ‎ 12 years and up
  • Item model number ‏ : ‎ BSI-203
  • Date First Available ‏ : ‎ April 3, 2007
  • Manufacturer ‏ : ‎ Bob Smith Industries Incorporated
  • ASIN ‏ : ‎ B0166FFFJ8
  • Customer Reviews:
    4.8 out of 5 stars 746

Product Description

MID-CURE 15 min. epoxy is used in larger areas where more working time is needed. It is more water resistant and can be used as a substitute for QUIK-CURE in most applications. MID-CURE is our most flexible epoxy and is ideal for gluing to fiberglass surfaces. Allow 45 minutes before handling parts and 2 hours for full strength. Directions in 5 different languages.

What's in the box

  • 15 Minute Epoxy & Hardener

    • Looking for specific info?

    Customer reviews

    4.8 out of 5 stars
    4.8 out of 5
    746 global ratings

    Customers say

    Customers like the value, ease of use, mixing, quality and performance of the bonding adhesives. They mention that it's a great buy, works well and gives you time to work it. Some are happy with stiffness, and drying time.

    AI-generated from the text of customer reviews

    86 customers mention83 positive3 negative

    Customers are satisfied with the quality of the bonding adhesives. For example, they say it's an extremely strong bond, strong epoxy, and very solid when fully cured. Some mention that the weight/size is deceiving, but it seems to be holding up great. Overall, most are happy with the product's quality.

    "...Fast set-up and hold time and strong bond after curing." Read more

    "...The epoxy adhered nicely to the sanded plastic and the cure time was long enough to set the job up well without having to panic...." Read more

    "...Also if head needs slight adjustment while drying the glue allows for smooth adjustments and easily holds new position...." Read more

    "...It was easy, setup quickly and seems to be holding up great!" Read more

    41 customers mention37 positive4 negative

    Customers are satisfied with the performance of the bonding adhesive. For example, they mention it works well, it dries clear, and it's a great product for knife making. That said, some complain that it doesn't bond well to styrene.

    "I've been using this for many years and it always works great. Fast set-up and hold time and strong bond after curing." Read more

    "This epoxy works well. It adheres, sets hard and strong, and does exactly what it's supposed to do...." Read more

    "I used this to make a textured grip on a Glickman. It worked perfectly!" Read more

    "Worked well had no problems" Read more

    38 customers mention31 positive7 negative

    Customers find the bonding adhesive easy to use. They mention that it has a fast set-up and hold time, and a strong bond after curing. Some say that the product has s a good 15 min working time, yet not too slow to set up.

    "...Fast set-up and hold time and strong bond after curing." Read more

    "I bought this to reattach a recoil pad on an old shotgun. It was easy, setup quickly and seems to be holding up great!" Read more

    "...for me, it gives adequate working time for most tasks but sets up quickly enough to mean you don't need to wait hours and hours for it to harden...." Read more

    "...And it was still a bit tacky overnight. This stuff gave me time to work it and was hard the next morning...." Read more

    17 customers mention17 positive0 negative

    Customers find the bonding adhesives to be a great buy. They say it's an inexpensive epoxy that works well.

    "Epoxy mix is well worth the buy. It hardenes well @ a convenient time frame to finishing your last crafting touches. Purchase this!" Read more

    "So much easier to use than those double-syringe types. And much cheaper, too." Read more

    "Great product and price, so much more value then those bought in big box stores...." Read more

    "...hardener is labeled as such, which can be very helpful, and the value is incredible: easily six times more epoxy than the name brands we are all..." Read more

    7 customers mention7 positive0 negative

    Customers like the stiffness of the bonding adhesive. They say it dries very tacky, clear, and is stiff but has enough flex to not be. They also say it adheres, sets hard, and strong. Customers also mention that the resin doesn't turn white and stiff like some other epoxies.

    "...The longer cure epoxy is a little stronger, less rubbery, and gives you more time to mix properly than the quick cure stuff." Read more

    "This epoxy works well. It adheres, sets hard and strong, and does exactly what it's supposed to do...." Read more

    "...While it is not the same as the adhesive used by TM, it is somewhat flexible and the lower melting point makes it easier to remove a head...." Read more

    "...This stuff gave me time to work it and was hard the next morning...." Read more

    4 customers mention4 positive0 negative

    Customers like the drying time of the bonding adhesive. They mention it's easy to apply, it dries fast, and it s very tacky.

    "In terms of value, this is the best non-bulk epoxy I've found. It dries very tacky, clear, is stiff but has enough flex to not be brittle...." Read more

    "...drops on a couple of pieces of wood, it mixed easily enough and dried pretty fast...." Read more

    "...Easy to apply , drys fast , strong , tip stays clear with snap on cap,Price is right...." Read more

    "Works great. Dries clear. Extremely strong. You can handle your glued item after 45 minutes, and it's at full bond strength in 3 hours." Read more

    4 customers mention4 positive0 negative

    Customers find the bonding adhesive easy to mix. They say it gives them more time to mix properly than quick-cure adhesives. Customers also mention that it adheres well to sanded wood and holds onto carbide dust.

    "...cure epoxy is a little stronger, less rubbery, and gives you more time to mix properly than the quick cure stuff." Read more

    "...I need more time so am now going to try the 15 minute set. It mixes well, sets up nicely and a great size, very good price and comes in EXCELLENT..." Read more

    "...and only used a few drops on a couple of pieces of wood, it mixed easily enough and dried pretty fast...." Read more

    "Mixed easily dried quick. Adhered to sanded glock well. Held onto carbide dust." Read more

    4 customers mention4 positive0 negative

    Customers find the size of the bonding adhesives to be great and convenient.

    "...It mixes well, sets up nicely and a great size, very good price and comes in EXCELLENT storage containers. Easy to use and with double sealing." Read more

    "Great product, convient" Read more

    "Epoxy performs as advertised. This is a great size and the bottles are so much more useful than those syringe type applicators available at the big..." Read more

    "...repair jobs around the house and the 15-minute version is perfect for medium size jobs where 5-minute sets too fast." Read more

    epoxy, what else can one say, works as advertised.
    5 Stars
    epoxy, what else can one say, works as advertised.
    epoxy, what else can one say, works as advertised. In my shop I use epoxy every day...
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    Top reviews from the United States

    Jeff in Texas
    5.0 out of 5 stars My "go-to" epoxy
    Reviewed in the United States on August 13, 2023
    Verified Purchase
    I've been using this for many years and it always works great. Fast set-up and hold time and strong bond after curing.
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    MuxDux
    5.0 out of 5 stars Good basic epoxy - slightly longer cure time helpful
    Reviewed in the United States on November 15, 2018
    Verified Purchase
    I used this to rebuild and reinforce a small section of the handlebar casing of a Vespa scooter. Two chunks of quarter-sized plastic had broken off the bottom of the back half of the casing, taking with them a hole through which a screw holds the halves of the casing together. I had managed to save one of the chunks, but the other was gone. I superglued the chunk I had to the casing to hold it in place temporarily, cleaned and sanded the area. Then I spread four layers of fiberglass cloth, wetted out with epoxy, across the chunk, the hole, and the intact part of the casing to reinforce the glued chunk and rebuild the missing chunk. Once that started to cure I used another small batch of epoxy to fill in the gaps. I let it all cure overnight, ground off the excess with a Dremel tool, and redrilled the hole. The epoxy adhered nicely to the sanded plastic and the cure time was long enough to set the job up well without having to panic. The longer cure epoxy is a little stronger, less rubbery, and gives you more time to mix properly than the quick cure stuff.
    4 people found this helpful
    Helpful
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    dubeiram
    5.0 out of 5 stars Perfect balance of work and cure time
    Reviewed in the United States on September 4, 2022
    Verified Purchase
    This mid cure formulation is the perfect balance of work and cure time for clubmaking. Im a bit slow and careful when gluing up clubs bu can still do 5 clubs before the glue gets a bit stiff. Im sure others can do more. and on the back side can be handled in about an hour or so. Also if head needs slight adjustment while drying the glue allows for smooth adjustments and easily holds new position. I just find this a far better choice than 5 minute epoxy which puts you on a hard clock with little adjustment time and little dry time benefit..
    2 people found this helpful
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    Yewtawdude
    5.0 out of 5 stars Easy and strong.
    Reviewed in the United States on April 15, 2023
    Verified Purchase
    I bought this to reattach a recoil pad on an old shotgun. It was easy, setup quickly and seems to be holding up great!
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    Adam Machanic
    4.0 out of 5 stars 15 minutes? More like 8.
    Reviewed in the United States on May 31, 2019
    Verified Purchase
    This epoxy works well. It adheres, sets hard and strong, and does exactly what it's supposed to do. I like that it comes in two separate bottles with caps. If you close everything up this product will last over repeated uses. Huge upgrade over the usual hardware store epoxy that comes in the split tube.

    Why did I deduct a star? My understanding is that I should have 15 minutes to work. But that's not the case. The product starts getting warm at about 6 minutes. That's a warning that time is running out. By 7 minutes it's quite warm and starting to clump, and by 8 minutes it's like hard rubber and you're done.

    The first time I tried this product I wasted half of what I'd squeezed out due to this issue. Now I know. Watch the time carefully and make only as much as you know you can use in 8 or so minutes. You can always make more later.

    Good stuff. Just important to know what you're getting yourself into. I will try the slow cure next time.
    13 people found this helpful
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    Joey Vincent
    5.0 out of 5 stars Excellent!
    Reviewed in the United States on January 14, 2024
    Verified Purchase
    I used this to make a textured grip on a Glickman. It worked perfectly!
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    J. T
    5.0 out of 5 stars flexible and with low melting point
    Reviewed in the United States on March 29, 2022
    Verified Purchase
    I chose the No.203 epoxy to assemble golf clubs and have used the product numerous times over the past three years. It is significantly more flexible than other epoxies. This makes it an excellent choice to attach heads to shafts and to fix an extender in the butt end of a shaft.

    Another feature of No. 203 is that it has a lower melting point than other epoxies. This is particularly useful when removing a head from a graphite shaft. With No. 203, I am able to use an electric heat gun instead of a propane torch to heat the hosel or adapter. This minimizes the chance of damaging the paint on a club head or distorting an adjustable adapter.

    Many DYI's who work on golf clubs use the hardest epoxies with high melting points they can find. I've worked on clubs in which the original J-B Weld was used to hold the head to the shaft. When such an epoxy is used, it is nearly impossible to remove the head without damaging the paint and, most often, without damaging the graphite shaft, which are, themselves, made of graphite cloth saturated with an epoxy-like resin. When the graphite shaft is overheated while removing the head, it is destroyed.

    If you work on golf clubs, you will have noticed that many manufacturers are now using an adhesive with a low melting point similar to No. 203. In particular, TaylorMade is using something which never seems to completely harden and remains somewhat "gummy". When I noticed this three or four years ago, I searched for something similar and found BSI-203. While it is not the same as the adhesive used by TM, it is somewhat flexible and the lower melting point makes it easier to remove a head.

    I did have one failure where the head came loose when playing. However, I attribute this failure to poor work on my part, either by not having mixed equal parts of epoxy and hardener or by moving the position of the head on the shaft while it was setting up.
    3 people found this helpful
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    Louis Fernandez
    5.0 out of 5 stars Work well
    Reviewed in the United States on January 6, 2024
    Verified Purchase
    Worked well had no problems
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