Hi,
I have my home-brew CNC setup with fixed-speed router (yes, I realize this limits me... some day i'll upgrade to a fancy water-cooled vfd spindle )

Anyway, I want to mill some 3/8" polycarbonate. Just a basic 2D cutout, no pocketing or drilling.
Plan is to use either a 1/8" O-flute bit, or a 1/4" 2-flute low-helix bit.
Router runs at 27000 rpm.

Any recommendations for doing this without melting the crap out of it? So far the only ideas I have are a lot of compressed air for cooling/chip-clearing and some WD40.