mixing on tin foil is a good way to go. - bubbleless expoxy start from when and how you take it out of the bottles.....if you use a syringe - do it SLOWLY so you dont draw air in at the time - same thing when you squeeze it out - nice and slow. I usually put the resin down first onto tinfoil - then the hardener in the middle of the resin - I use the top of my epoxy brush to mix it - nice small circles - mix slowly - keep the tip of the brush on the surface - dont lift it - if you do- you trap air. it usually take 2-4 minutes to mix it right - goes from clear to streaky to clear again. let it sit for a minute to get the bubbles (if any) to the top - use a gas torch to lightly go over it - to break the surface tension and release the trapped bubles
- epoxy works thermotrophically - so it gets warm when it sets due to the chemical reaction - if you spread it ou on tinfoil - it does not have the depth/concentration to go off quickly - so it is a double good idea - plus when you're done - you just screw up the tinfoil and into the bin