On 1968 convertible the differential seal failed and leaked grease onto underbody. On this car the drive shaft rear u-joint then failed, came loose, and damaged underbody fiberglass near differential which now needs repaired. Since this area is heavy with grease from failed seal, what is best cleaning procedure of fiberglass prior to repair??? Concern is if oil from grease has been abosorbed into the fiberglass.
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Re: Fiberglass Cleaning
Larry, I would give it a good cleaning with some Castrol super clean, then follow up with some lacquer thinner. If there is a hole I would enlarge it ( I use a Dremel) so that you eliminate the jagged, oil soaked fiberglass and expose a clean edge. Then go ahead and repair. Tom -
Re: Fiberglass Cleaning
In bilges of antique mahogany boats soaked with years of dripping oil, I have had good luck using denatured alcohol. It would help leach the oil up out of the wood. Maybe try spraying some on a test area to see if it helps. Only problem is that gravity is against you.
You really want it to soak below the oil to lift it up and away.
Rich
p.s. btw, do not use acetone. It is too strong. That will break down the resins in the fg.Comment
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Re: Fiberglass Cleaning
Once you clean it like the guys said you can spray it with K2r ( a fabric spot remover in the grocery ). I use it to leach out oil in whatever, it go's on wet and soaks in then dries to a powder that holds the oil. I have to repeat a few times even after cleaning with laquer thinner.
I use it even with a clean looking surface and find spots that are bleeding oil. It's not a must but if you have doubts about it being clean enough after washing it will tell you by drying pure white.
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