Charles, the epoxy requires the mixing of two parts, much like Envirotex (I think...). The product comes with two bottles, resin and hardener, and they are typically mixed with equal measures of the two fluids. Very thorough and patient mixing...or else!!!
I used a product called Nu-Lustre 55 by Swing Paints.
Regardless of additions, the product typically takes about 6-12 hours to harden enough that your finger nails click on it and leave no dents.
I didn't know what to expect when I added the modified final epoxy layer, but I knew I was no longer content with the clear previous two layers. They were nice and clear, looked good, but the surface was like glass...no texture. And how many rivers and streams are perfectly clear? Most are turbid and murky, almost like pea soup.
When I mixed the first two pours, they did bubble a bit, but these bubbles are easily dealt with....seriously. More about that in a second. But when I added the other two items, there was some early serious frothing of a sort, foaming maybe. I didn't really care, and kept mixing to ensure a homogeneous mix as the instructions caution. When I poured the batch, and spread it evenly with a wooden skewer, I was gratified to find that the foaming had stopped and that the entire pour was essentially bubble free!!!
All I had to do was to wait until it cured and then stipple on the top surface the gel gloss medium.
For any medium that seems to have tiny bubbles throughout it, take a soda straw and place one end in your mouth. With the straw at a 45 deg angle or so, and the open end about 3/4" above the surface of the new pour, simply blow a warm jet of air (gently!) all over the places where you see bubbles. They will disappear like magic.
I know this is long, but a final note. I would advise you to go lightly on the paint half drop, and I am not sure I would use the Hauder Medium Green a second time. It looks great in photos, but not so great standing over it. To dark, not enough yellow. So find a green more like spring foliage green and try that. You want a half drop in a volume of epoxy of maybe 3/4 cup, and that should be spread about 1/8" thick over a wide area, say 1.5 square feet.
No pours of any kind of medium should be thicker than about 1/8" to 1/4". Better to have to do two or three pours, correcting for problems in hue and turbidity as you go along, than to pour 1/2" thick and hate the result. And thick pours take forever to harden and to clear. Harder to clear the tiny bubbles, too....sometimes impossible.
-Crandell