As a trial, you could heat some bees wax in a pot immersed in some hot water (don't heat the pot over direct flame as you will burn the wax), put your projectiles into a sieve, and dip them into the hot wax. Pull the sieve out and shake it to get the excess wax off the projectiles, and provided you 'dip and shake' quickly, the wax will freeze off pretty quick on the projectiles due to their thermal heat sink. It would be a bit like deep frying chips.
I would imagine a shorter dip time (less time for the projectiles to warm up) would give you a thicker coating due to faster wax freeze. Longer dip time (higher projectile temp when you pull them out) would give you a thinner coating, if you are giving them a shake while the wax is still liquid. A cold water plunge when you have got the coating you want would freeze things off quick.
Doing 1/2 dozen projectiles at once would help as it gives you something to tumble against to remove excess wax while it is still liquid.
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