Milling Plastazote LD33 closed cell Foam - Any milling advice?

[Zeeflyboy]

It's got good structure but somewhat soft and giving if you squeeze it... Nothing like a rigid insulation foam, and it bounces back rather than crushes. I believe that it's a type of polyethylene foam which is available in various densities - this one is 30kg/m3

It's actually two sheets - one 30mm yellow and one 5mm black. The plastazote stuff is available in black, white, red, blue yellow or they have some cheaper similar foam in black and white only. You can then heat weld them together (carefully!) using a hot air gun to create the bi-colour piece.

I've managed to find some clean looking machining of similar looking foam where they were using single flute down cutter, so i've ordered two of those (a 3mm and a 6mm) to have a try with.