Quick tips:
There are two ways to use these! As the ink comes out it is blue, as it dries, it turns clear. The blue is intended to create a permanent bond and the clear more temporary. This will come up later.
Heat Embossing: You can see in the video attached, that is basically creates a taller line than your traditional ink pad or embossing pen. That ink is relatively thin and the texture fully comes from the embossing powder. When you use this glue instead, it adds more dimension, creating more raised lettering, etc. You can apply heat embossing powder while the glue is still blue or once it's a bit dried (temporary) and the powder will stick no problem. Use your heat tool like you normally would, but be ware of bubbling! I noticed this a bit and think it's a result of not letting the glue dry enough after applying the powder.
Glitter: No embossing powder? No problem, just use regular ole glitter. The result is really neat with little if any flaking after it fries.
Foiling: I have a ton of toner reactive foil that I put to work often with my laser printer and laminator, I've never used for any other purpose until now. You can use this pen to write or draw or outline or trace whatever you want. You MUST let the glue dry. If it is still blue in any area, your foil will just smear the glue. You need it to be in a tacky sweet spot. Then just place foil over the glue, run your finger over to adhere, and peel off. If you have any missing spots you can always do touch ups with the glue pen or run the foil back over. As pictured, you can use this to add to an existing drawing or lettering project or just to be it's own thing. This is a game changer for how I use my foil sheets, much easier to use than the deco foil adhesive in my opinion.