SJ23 hull finishing question

["splinky 3000" <splinky3000@xxxxxxxxxxx>]

Hey Everybody,

I am refurbishing an SJ23, the hull has some discoloration patches (roughly 
8" diameter, various locations) that I am trying to remove/fix.

Initially I thought these patches were just exterior water stains that would 
disappear with polishing/buffing, but didn't.  Upon further inspection, the 
stains seem to be below the gel coat surface; the surface is still nice and 
smooth with no blisters, cracks, etc., so I am wondering if the gel coat 
became porous in some areas allowing moisture to seep through.

I tried applying a mixture of TSP and oxalic acid, this didn't seem to do 
much.  Next thing I tried was some FSR, which is just strong oxalic acid in 
a gel - I was thinking this might permit soak into the surface more readily; 
this didn't work either.

Has anybody seen this phenomenon before?  Any way to remove these patches?  
Is a new paint job the only solution?

Any suggestions are greatly appreciated, Thanks!

- Mike

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