Birchwood Casey Liquid Gun Blue Kit Remover/Perma Blue/Degreaser – BC-13801 Birchwood Casey Perma Blue Liquid Gun Blue Finishing kit, Multi, One Size Easy to use, all-inclusive kits are way to touch up or completely reblue most guns. Everything you need for a professional-looking. From the fast-acting liquid gun blue kit and the deep, dense paste gun blue kit. Note: Perma blue liquid gun blue will not blue stainless steel, aluminum or non-ferrous metals. For touching up or completely reblueing most guns. The fast-acting liquid gives a non-streaky, uniform blue-black finish. Generous supply of everything you need to do a job.