Discolouration on Hull

[dmgf]

We have finally found the boat we like and want after a long search. Have made an offer and it has been accepted. The only issue we have is there is some slight discolouration on the top starboard bow. You can see it clearly in the right light but it does not photograph as it is. It sort of looks like someone has maybe used oxalic acid on the deck and has somehow wiped down below the toerail. It is not a stain but more like a bleaching effect. The owner genuinely seems to not know how it was caused. He always let the boatyard do the cleaning/ waxing of the hull. The boat is 4 years old. It's a pain because when you are paying alot of money for something you like it to at least look good and we always have resale in the back of our minds too. Any ideas on a solution to making the discolouration go away?? Appreciate any imput. Thanks G&D

[SailFastTri]

With the seller's permission, or after it's yours, you can try using some Fiberglass Stain Remover (FSR) or equivalent acid-based hull cleaner (such as Mary Kate "On and Off" hull cleaner) to see if you can clean the remainder of the area to match.

[capngeo]

A less expensive alternative to the above would be diluted muriatic acid... 50/50 with water!

[Sunspot Baby]

My experience with oxalic acid is that if it is not rinsed well, it leave a light tan/beige stain. I have successfully removed it with polishing compound.

Your stain doesn't sound like oxalic, but try a little rubbing or polishing compound on it.

Good luck.

George

[dmgf]

Thanks for the replies. Will keep all in mind and pass onto owner. When we finally get the boat will try ourselves if need be.
G&D