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[Catalina007]

also try using Barkeepers Friend. About $2.50 and does the job.
But ots all short term success.  The gelcoat surface becomes pourus when old and the only real permanent cure is a new paint job at the emd of the day 


   

[Ron Hill]

Guys : Barkeepers Friend has Ocylic (sp?) acid in the powders form.  FSR (Fiberglass Stain Remover) has the same acid in the gel form. 

I was much happier when I moved the water line up - because that small white strip was usually under water anyway (hence the stain).  That's why Gerry Douglas told me that the 3ft+ draft (wing keel) was a design goal which Catalina missed!!  The real draft (C34 loaded) is closer to 4ft 5 in.  So you might as well raise the water line anyway because the boat sits lower in the water than the gelcoat trim was designed for!!!  Save yourself some work each spring!!

A few thoughts

[Jim Hardesty]

The gelcoat surface becomes pourus when old and the only real permanent cure is a new paint job at the emd of the day

My thoughts exactly.  I think if you don't have 2-3 inches of bottom paint above the static water line, consider moving it up. Think painting the white would work.  Really, IMHO, the only ones that get a close look at the hull below the boot stripe are fish and seagulls.  Not the usual sort that I try to impress with a bright white stripe.  Lots of other things much higher on my priority, much to the chagrin of the fish and seagulls. 
Sorry if I sound dismissive but really it's only obvious when the boat's out of the water.
Jim