Join Date: Jul 2000
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What do I dooooooooooooooo!!!!!!?????
Not a big problem !!!!!!!
Probably iron oxide (from debris from prior Cetol application) or tannin release from the wood thus staining the hull. Remedy: Soak the stains with OXALIC ACID (wood bleach, acid teak bleach, "Zud" cleanser, etc. - cheaper if you buy it from a hardware/paint store.). Should *instantly* remove the stains. Cetol and a now a lot of other finishes contains microscopic iron oxide to prevent UV degradation of the finish, ... its the iron that enters and stains the surrounding gelcoat .... if the gelcoat has become porous.
The real underlying symptom that you describe is that probably the gelcoat has become very porous from oxidation and severely needs to be compounded and waxed; -- the immediate next future stage of deterioration is teeny micro-checking (macroscopic alligatoring) of the surface.
Periodic high speed power buffing with very fine compound (1300+ grit) and WAX to keep the gelcoat sealed is the best prevention. If the boat is in the water, wash with oxalic to remove the staining, then seal with carnauba wax and do the restoration/buffing/waxing next time that you are on the hard.
For some reason the gelcoat on a lot of early and mid 80s boats degrade like this faster than others. Ya gotta keep them buffed and waxed.... and then strip the old dead wax once a year with caustic, rebuff and rewax to keep the gelcoat sealed.
Hope this helps.