Been using FL extensively for 2 years. I bought a cheap WM large oval crockpot to treat my parts. I heat it up on low, add my degreased parts, polymer, metal, etc, and then slather on FL paste. I let it cook on low for an hour or so. Then remove the parts, let them cool, and wipe off the excess. That's the initial 1-2 cleanings, then I just use the liquid as a normal CLP, with a little paste on any aluminum frame rails.

You can also use a hair dryer or the sun to warm the gun parts, but the cp makes it a little easier.