How do you fix blisters on a fiberglass hull?

Following Interlux Interprotect® 900 Bulletin, assuring blisters have been ground out and the hull is dried, products such as Epiglass can be used as epoxy resins to seal the missing areas of the gelcoat. Then the products Watertite®, fairing and filling compounds, may be used if there are any minor areas of gelcoat missing or if there are any surface imperfections present. Once the boat has a dry, smooth, sealed surface and has been adequately cleaned, Interlux Interprotect® 2000E or InterProtect HS barrier coat may be applied, to prevent the occurrence of osmotic blistering problems from in the future.