I have a Spitfire tank that came with my Lightning project. I have used it with no leaks, but sealed it this past summer with Caswell's stuff. I want to get it repainted soon, but there is a round ding in the top that looks crazed (sp). Little fusures not deep, but they need to be filled before painting. I am not familiar with fiberglass repair so what should I use to fill in these cracks?? Thanks in advance Steve in Ohio
I haven't used it on motorcycle tanks, but I used to use a product called Marine Tex to repair cracks on fiberglass sailboats. It is an epoxy gelcoat paste that hardens to be very strong and tough. It is easily sandable however. You can get it in small quantities at shops that sell yacht equipment and supplies. JB Weld might be as good, but if it was mine I'd try Marine Tex. This is the stuff: http://tinyurl.com/56upn
For best results, first use a suitable burr on a Dremel tool to open out the cracks and get to good solid material. If the cracks are very minor, just make a V centered on the crack. Usually you have to go through the gelcoat - just. Blow out dust with dry compressed air; cleanliness is important. Fill, sand, repeat. When fully cured, prime, sand and paint.
Cheers Rick F
#51308 - 01/30/079:27 pmRe: fiberglass tank repair
Joined: Jun 2004 Posts: 1,115kboyd
BritBike Forum member
BritBike Forum member
Joined: Jun 2004
I did a lot of research into coating for the inside of tank. It is unclear if you are doing outside or inside.
Be aware that any coating on the inside, if it fails has to be stripped out, and that is not as easy as it sounds. The stuff sold as Kreme has been failing for a lot of people. Seems that the alcohol in the gas is wrecking havoc. I don't know about the caswell. People seem to swear by it on this site.
Bruce posted this today. Apparently fiberglass is under attack by the new gas, and marine engines are getting ruined by the dissolving fiberglass.
# Fiberglass Fuel Tank Damage Even low concentrations of ethanol have been shown to damage fiberglass fuel tanks. Ethanol dissolves the lining of fiberglass fuel tanks, often depositing a dark "sludge" inside marine engines causing costly damage. Eventually, fiberglass tanks dissolve until they fail, leaking fuel.