"Preping Fiberglass For Auto Body Primers And Paints"
For Fiberglass Auto Body Repair you will need to use some resin, catalyst and fiberglass matte products, unless your vehicle is made from a product called Fiber Reinforced Plastic (FRP).
Those vehicles will require specific repair materials that are unique to their physical make-up and to their chemical design.
There are professional auto body fiberglass repair technicians who prefer to cover a finished fiberglass auto body repair with a light coat of glazing putty to reduce the problem of air bubble induced pinholes.
Air bubbles in resin are a common hazard and pinholes found on the surface are sometimes impossible to avoid.
Unless you have to abide by special product instructions, you would mix and apply auto primer to a fiberglass auto body repair using the same methods as for sheet metal and regular filler bodyworked surfaces.
As long as you maintain control while you apply the auto primer, masking about two feet in all directions will be sufficient.
You would then simply use400 - 80 -grit wet and dry sandpaper to smooth down the surface by wet sanding.
After you have finished sanding down the primer material, there won't be any dry dust to remove however the dust and water mixture created by wet sanding will most definitely have to be thoroughly cleaned off using a mild detergent (not wash and wax) and plenty of clean fresh water. You are then set to mask the vehicle.
Use wax and grease remover to thoroughly clean the surface followed by a wipe down with auto glass cleaner.
Wipe with a tack cloth and then spray the appropriate paint sealer. When you've reached the flash (drying) time, tack off the body again and paint.
