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Old 09-10-2009, 03:11 PM
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Default Acid wash boat

Hi i know Oxalic acid is the common acid to get stains out of boats but i cant get it here can i use Muriatic or some other acid (diluted ) as a substitute..thanks
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Old 09-10-2009, 03:19 PM
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Hi i know Oxalic acid is the common acid to get stains out of boats but i cant get it here can i use Muriatic or some other acid (diluted ) as a substitute..thanks
Get something that's labelled as safe for fiberglass.

See if you can find deck cleaner (for wooden decks on homes). Look on the label, "Dekswood" deck cleaner is oxalic acid and is safe for fiberglass.
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Old 09-10-2009, 03:25 PM
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Hi i know Oxalic acid is the common acid to get stains out of boats but i cant get it here can i use Muriatic or some other acid (diluted ) as a substitute..thanks
I've used it on my boat. It works but watch yourself. Its nasty compared to other acid I have used. You would probably want to be extra cautious if you are in a envirormental freindly area too. .. For yourself maybe a resperator and eye protection as a minimum.
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Old 09-10-2009, 04:36 PM
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Concentrated Muriatic (HCL) will damage the gel coat--and is nasty for humans.
Oxylic acid is used by paint companies as a wood bleach. I suspect that there must be some companies in the chemical or paint business which have the powder. I just disolve the powder to make a concentrated solution of oxyalic acid. You do need to wear gloves and eye protection, but much safer than HCL.
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Old 09-10-2009, 04:49 PM
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Concentrated Muriatic (HCL) will damage the gel coat--and is nasty for humans.
Oxylic acid is used by paint companies as a wood bleach. I suspect that there must be some companies in the chemical or paint business which have the powder. I just disolve the powder to make a concentrated solution of oxyalic acid. You do need to wear gloves and eye protection, but much safer than HCL.
What do you think about H2SO4?
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Old 09-10-2009, 05:00 PM
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What do you think about H2SO4?
im thinking the difference is Oxalic is an organic acid while H2SO4 (sulphuric Acid / battery acid) is mineral my understanding is to use organic acids where possible for cleaning fiberglass...tho i am no chemist just a thought..
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Old 09-10-2009, 05:07 PM
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I use a product which contains HF + H2SO4 and H3PO4 and it workd great.
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Old 09-10-2009, 05:18 PM
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I use a product which contains HF + H2SO4 and H3PO4 and it workd great.
ok seems most acids will work just a question of using them safely and keeping away from the boats metal bits. Will see what i can find locally and give it a try (on a small hidden patch first)
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Old 09-10-2009, 05:21 PM
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Actually it just occurred to me that they use alot of acid for cleaning Terrazzo tiles here , i will have to find out what type of acid that is , my guess HCL...hmmm
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Old 09-10-2009, 05:34 PM
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Oxalic acid in paint stores, sold as wood bleach.
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Old 09-10-2009, 05:35 PM
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also check with a local power washer as it is used to remove rust from concrete.
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Old 09-10-2009, 05:45 PM
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unfortunately guys i live in West Africa no such thing as a hardware store or such and certainly wont find wood bleach (they call it sun out here ) have to find something they use locally. they do build houses here using terrazzo floors (nice and cool) will check that or could find H2SO4 from battery suppliers...necessity is the mother ...and all that
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Old 09-10-2009, 05:52 PM
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While I am not a chemist either, I will tell you to be cautious if your boat rides on a galvanized trailer. Muriatic acid will disolve the zinc and you'll be left with bare steel spots. I don't know the concentration needed to do this, but galvanized gutters in the old days were soldered at their joints using lead solder and they were cleaned with Muriatic acid to remove the zinc so the solder would stick.
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