Today I will take from him he'll have to do it. I do not want him to do anything else with my machines.

Thanks for your help

What is the game Fly?

I've had problems with games without mylar (where lots of wax has been used) with similar results.  Although it looks bad, it can be rubbed back and redone without to much issues.

Locally here in Australia & the USA there is a product called Presol http://pc.dupont.com/dpc/en/US/html/visitor/common/pdfs/b/product/dr/ChromaSystemLV/H-19397_3919S.pdf

As long as no residue is left, this is an excellent product.  Your spray painter should have it.

If the playfield is NOT already cleared (ie pre 1990 game) I find a very light first coat (dry) followed by normal coats eliminates the chances of this occurring.