If you make your ecto goggles out of weilding goggles the spray paint could easily peel off because the rubber material the weilding goggles are made of are very flexible. try this: before you spray paint your goggles, sand down the parts you want to paint with either sand paper(can take a long time and very annoying) or a dremel tool. this will make the paint stick better to the goggles. for extra peeling protecion, put a coat of primer on before you spray paint the color you want.i hope this is in some way.