I recently made my first batch of caps using Prime-All, after doing A LOT of reading on this and other forums.
I left out the tan/off-white components, which is either dextrin or gelatin intended to be a binder. Instead of using that, I took a 2 oz. plastic bottle with a needle oiler tip, put a few millimeters of Duco cement in the bottom, then filled the rest with acetone to make a saturated solution.
Using a CCI Large pistol primer tray as a loading block I filled about 20 caps at a time with the mixed Prime-All compound and then put a drop or two of the Duco/acetone solution in it. Using a small piece of bamboo cut from a chop stick I gently tamped down the wet mixture.
After the caps were visibly dry I put another drop or two of the solution in the caps and let them dry in the open air overnight. I wanted to ensure that enough Duco cement was deposited in them to keep the priming compound in place. Duco is a nitrocellulose based glue so it's flammable even when dry.
The caps worked well when I tried them a couple days later.
For safety's sake make sure that you crush any lumps in the components before mixing them. Crushing lumps after the components are mixed can cause detonation.