>>8672481Hi OP, I do some custom masks and motorcycle helmets If you want red lenses you have 2 options. well there is a 3rd option i'll explain last.
#1: It the lens is removable you can replace them with colored lexan or other Plexiglass that can be bought in sheets. This works best for flat lenses as you don't have to heat and mold it. You will have to cut it to shape and the plastic might not be optically correct or have artifacts in it. to cut it you will need to keep the protective plastic cover on and score the plastic sheet in the pattern that is slightly larger than the original. You can use a thin saw then a very fine sand paper to smooth the edges to take off the saw marks and excess plastic.
#2: Rub on mylar tint. there are many kinds and suppliers if there is an auto shop that does custom tint in your home town call them up and see if they have red or mirrored red. This is good on actual glass, some older gas masks and aviator goggles use glass lenses and the tint will adhere nicely. you have to clean and prep the surface then smooth the tint onto the lens to get out the air bubbles. There is a small selection that will adhere to plastic and polycarbonate lenses but it normally has to be special ordered.
#3: The 3rd method requires a lens with an anti fog coating. most motorcycle face shields have a thin plastic coating on the inside that resists fogging from your breath and body heat. This coating can be tinted using normal fabric store liquid RIT dye. prep your dye pot and submerge the lens in the dye bath for a few seconds. this will lightly tint the anti fog coating. use a dark red dye and repeat the process 2 or 3 times to get a transparent colored lens.
