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Go Back   SailNet Community > On Board > Gear & Maintenance > Black / gray deck spots - how to fix / prevent?
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Thread: Black / gray deck spots - how to fix / prevent? Reply to Thread
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Topic Review (Newest First)
05-06-2013 12:12 PM
g0twind
Re: Black / gray deck spots - how to fix / prevent?

Quote:
Originally Posted by chucklesR View Post
FSR cleaner would make that white again, but then you'd need to compound and wax it.
I tried FSR and it was unable to remove the black spots. I will be compounding and waxing before launching again to protect all my hard work
05-06-2013 11:33 AM
svHyLyte
Re: Black / gray deck spots - how to fix / prevent?

Quote:
Originally Posted by Reefpoints View Post
I'll try the dollar store citrus cleaner first (thanks TropicCat), if that doesn't work I'll look for the stronger stuff that svHyLyte recommended.
We did not find that the Citrus cleaners worked very well and finally went with the more aggressive method mentioned. If the Citrus oil approach works for you, it is important to ensure that all of the residual oil is thoroughly removed as we discovered the stuff becomes medium for mold itself once its acidic content is depleted. Note that if you are in an area with a fair amount of air pollution, the finish surface on Gelcoat and/or wax will erode fairly quickly as moisture in the air combines with the sulfur in the air particulates to create acid (think acid rain). Frequent washing and wax application is the only defense.

In any case, Good luck...
05-06-2013 10:37 AM
chucklesR
Re: Black / gray deck spots - how to fix / prevent?

FSR cleaner would make that white again, but then you'd need to compound and wax it.
05-06-2013 09:55 AM
g0twind
Re: Black / gray deck spots - how to fix / prevent?

That would probably help....

05-06-2013 09:47 AM
Faster
Re: Black / gray deck spots - how to fix / prevent?

Quote:
Originally Posted by g0twind View Post
I had the same problem...only worse. It was all over my topsides.

Here is a shot of the cockpit. Almost all of the black on the transom was the mold.

I used diluted bleach and a Scotch Brite pad, followed by large amounts of water.

Do we get an 'AFTER' picture??
05-06-2013 08:58 AM
g0twind
Re: Black / gray deck spots - how to fix / prevent?

I had the same problem...only worse. It was all over my topsides.

Here is a shot of the cockpit. Almost all of the black on the transom was the mold.

I used diluted bleach and a Scotch Brite pad, followed by large amounts of water.

05-06-2013 08:49 AM
chucklesR
Re: Black / gray deck spots - how to fix / prevent?

Part two of your question was how to make it stay away.

Fill the micro pores/holes with wax, buff etc.

The only other way is to sell the boat and take up extreme rocking chair sports.
05-06-2013 08:17 AM
blutoyz
Re: Black / gray deck spots - how to fix / prevent?

Quote:
Originally Posted by TropicCat View Post
Denise is right....mold.

Right now, get in your car and find the nearest "Dollar Store". They're practically on every street corner here in Florida.

Go to their spray cleaner section and buy a couple of bottles of "AWESUM CLEANER". Yep. yellow liquid. This will set you back all of 99 cents a bottle.

Spray on the mold, let sit a minute and wipe off. EZPZ. This stuff is highly concentrated citric acid. Totally biodegradeable. I've been using it on gelcoat for years. Warning, if you let it sit on painted areas, it will remove the paint.

This stuff was made to clean gelcoat... just sayin..
I am going to try this for fine tuning my cockpit...Thanks
05-05-2013 07:43 PM
Reefpoints
Re: Black / gray deck spots - how to fix / prevent?

I'll try the dollar store citrus cleaner first (thanks TropicCat), if that doesn't work I'll look for the stronger stuff that svHyLyte recommended.
05-05-2013 07:37 PM
svHyLyte
Re: Black / gray deck spots - how to fix / prevent?

Quote:
Originally Posted by Reefpoints View Post
These weird and hard to clean spots have formed on my deck. They form in random patches. Please see these photos:






It's really hard to get them off - lots of scrubbing that I'm sure damages what's left of my non-existent gelcoat.

Does anyone have any idea what causes this? What I can do to prevent them? Also, any good ideas on how to clean it other than scrubbing and FSR?

Thanks!
It's called "Pinpoint Mold" and is growing in the pores in the GelCoat which is evidently very worn and has lost its glaze. Try covering it with paper towels soaked in chlorine from a pool company--not household bleach. The stuff will destroy the paper towel material quickly but should also destroy the mold if left over night.. Dose with a bit of Wink rust stain remover and then wash the area thoroughly with warm soapy water and rinse with fresh and then compound and polish. You've got to kill the mold spores and fill the Gelcoat pores. BTDT...
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