Excal advises just wax the whole string once, then keep the center serving well waxed by rubbing it in. The waxed serving keeps the rail lubed. Never heard of a problem w/ build up in trigger on an Excal. I've read where some guys use Horton rail lube on Excals, but I don't use anything, just another variable you can't control. You know, lube on, lube off, lube part on, part off........ I would think the wax is gonna displace any junk you smear on the rail.