Originally Posted by pindraak
I looked at some fiberglass boat sites, and they recommend repairing the oxidation by polishing it with grit, then using a fiberglass cleaner and then adding wax or polish. I'm a bit skeptical though. Grit polishing is actually going to grind/sand off part of the surface, and I don't see how thinning the surface is going to be beneficial to any purpose other than making it look shiny, which I don't care about.
Having had or been around boats most of my life and having purchased a fiberglass trailer that sat in the Idaho sun for the first 16 years of its life without a lot of proctection I am a firm believer in 3M marine products.
Yes once the boat or trailer has heavy oxidation the only way to get it off is by using a compound product. 3m makes one called Restore and Wax - you put it on with a wool compound pad - helps if you have a power polisher but doing it by hand is possible using micro cloths - I have done it by hand using micro cloths and its not really all that much more work than using a power polisher but you do get a higher shine with the power polisher. If its a light
oxidation they have another product thats called Clean and Wax. Yes using a compond to get the oxidation off will thin the gelcoat a little but if done correctly and not at a high speed and too much presure it should not take much gelcoat if any off at all and you should only have to do that once -the main purpose is to take off the oxidation not the gelcoat.
Once you have done the above you need to put on a ultra permormance paste wax a couple of times a year - to protect the fiberglass.
If you like the flat oxidation look then just the 3m Clean and Wax and then use a good paste wax over the trailer and that should stop it from getting worse.
And yes storing it under cover helps *a lot* at protecting everything - tires
, water and electrical
connection covers, rivit covers etc.