I've done the brush the pearl ex onto versamark but didn't seal it. It worked ok.
For the spray mixture, I bought a trial sized spray bottle at walmarts. I then filled it 2/3 full with hairspray and 1/3 full with rubbing alcohol and added about 1/8 teaspoon pearl ex. I also put 2 plastic beads in there to help mix it up. Mine has never clogged the nozzle. When I'm done I don't dump it out but rather just put it away
Put like the above poster said make sure to mix it well because all of the PE will be in the bottom. My spray bottles are clear so I'm able to tell when it's mixed up enough.