Krylon paint a Bantam nylon stock?

I can't speak for that particular stock but I can speak well (I think) for the material used to manufacture it. But your biggest challenge is how you do it: Prep-work is one of the key steps. First, it's not all exactly nylon, there are probably more glass fibers in that plastic blend than you realize (gives it more durability and strength). So sanding it in steps as if it is wood is key, although you will want to use either "De-natured" alcohol or rubbing alcohol with a 91% content or better to wipe everything down after to make sure that all releasing agents and oils are mitigated. After painting (allow at least a few days for off-gassing) you will want to seal it with something. If you do not, the paint job will not last. If you want a glossy finish, then a regular polyurethane will work. If you want a protective layer without excessive gloss, a matte polyurethane finish (or satin) is the way to go. The nice thing about matte/satin is that if it doesn't work out as glossy as you want (after a few days of off-gassing) you can always wet-sand it and polish it to something glossier if you wish. Any questions, just ask. I've refinished everything from high-end guitars to decks to cars etc.
 
 

I painted my gauntlet. Just made sure it was clean with soap and water. Holding up great. Took a long time to fully cure. It had a tacky feeling for a few weeks.

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Prep work is key

Like above use denatured.alcohol or in your first aide kit that 91% or better. I just use green scotch pads until the plastic looks dull then clean it. In the auto collision repair industry green scotch pad with pumice like gojo and some dish soap then scrub with water, rinse clean let dry or blow off with compressed air. At this point at home I'd just wipe down with 91% let dry and spray. On the can it should give you a tempature rating for use. Try to set up an area.you can control that. Use an old box fan pointing away from what you.are.painting to suck the over spray away from you. Tape some paper towels to the back of the fan as a filter. So it draws the air and over spray away from the stock ,It will grab most of the over spray. Makes clean up easier. It will dry and cure faster in a LOW humidity environment, so if you have an old dehumidifier and a warm place your doing pretty good. Fallow the set and dry times on the can. You may need to let the base coat/s cure for a day or two before using a clear coat. The vapors from the base may react with the clear and leave oily looking spots that look like a fish eye