Will brick cleaner damage gel coat / Grp?

[longjohnsilver]

As in title will cleaner containing 25% hydrochloride acid do damage to Grp and gel coat if used to remove shell growth on a hull? I've scraped off what I can but there's still quite a bit left sticking to the hull.
TIA.

 

[Bobc]

Drink a bit and see what you think

 

[essexboy]

I have used this for many years to clean the brown scum off around the waterline, I brush on, leave for about five minutes then wash off. Never had a problem, I'm sure you will do the appropriate risk assessment and slip into a pair of Marigolds !

 

[William_H]

should be quite OK. More danger to yourself than the GRP. Perhaps dilute the acid and try see if it will do the job on crustaceans. You may find tha tth ecrustacean has gone but the dame to gel coat and undercoats of paint remains. Only sanding will fix that roughness. If it is a shiny gel coat type trailer boat that has been left too long in the water the shiny finish will be destroyed. (takes about 3 weeks here in Perth with no a/f paint) good luck olewill

 

[philip_stevens]

Quite a few years ago, when I was on a container-ship plying to Aussie, I bought a container of GRP gel cleaner that was 10% hydrochloric acid, made by KH Industries. Still got a drop of it left.

B&Q patio cleaner "was" 8% hydrochloric acid. Not sure what it is now.

 

[vyv_cox]

No. Hydrochloric acid is not an oxidiser and does little damage to most things. It does not attack brass or bronze, or most types of rubber and elastomers and is fine on GRP.

 

[longjohnsilver]

Thanks all, will make the cleaning of the dinghy hull that much easier.