kieronriley
Well-Known Member
Well I’ve used it with great success for about twenty years and everyone in my sailing club have taken to using it above anything else, it’s just like magic!
Recurring Brown Hull
- Thread starter bobgarrett
- Start date
kieronriley
Well-Known Member
And at about a pound a bottle , isn’t it worth a try. I get two cleans per bottle on a 30 foot boat
Refueler
Well-Known Member
My GoTo was Cilit Bang Lime and Rust Remover - till the 'Greenies' complained and the formula changed ...
I don't find any Toilet cleaner doing as it used to ....
Wonder how long it will be before 'they' ban Oxalic Acid ?
Neeves
Well-Known Member
Oxalic acid is used to clean timber, or wood, and is feely available in Oz from most hardware stores packed as a dry powder in 1kg bottles. But then we can still buy Hydrochloric and Sul[phuric acid in the same stores, used as a brick cleaner and in swimming pools (and for home anodising)
Some brown stain is organic and some acids will not remove it. I think all 3 acids are good for Iron oxide staining but Oxalic is the go to for organic.
In all cases you don't need a very strong solution - but increased strength is quicker. But increased strength means you will have excess acid and too much to react - so if when you wash off you are washing unused acid off - so use plenty of water. If you use Oxalic on the deck when it dries you will return to the dry acid - so wash it off (I'm not sure that it is very good for dogs nor children
)Jonathan
Caraway
Well-Known Member
Another sure fire solution is to paint the topsides brown.
Neeves
Well-Known Member
If you are using AF as your boot top or the hull AF extends above the waterline the Oxalic will impact the paint.
Caraway
Well-Known Member
I used gloss paint as my boot top. If you used antifoul it would disolve away every time you scrubbed it. I
LONG_KEELER
Well-Known Member
Oxalic Acid works fine for me but only works in warm to hot conditions in the UK.
Poignard
Well-Known Member
Yes, that's very important.
Momac
Well-Known Member
I have used that also - and it is very cheap. The one that is marked 10X is the most powerful.
=
Spirit (of Glenans)
Well-Known Member
It had also occurred to me to recommend adopting a typical 1970s colour scheme of beige and brown?
jwilson
Well-Known Member
Some boats seem prone to brown above-waterline staining, some don't, even from the same manufacturers and similar ages. I have one that gets this, hull warm oxaliced and then washed off and wax polished at start of year, looks pristine, but within 2-3 months of launch brown staining starting. By 4 months afloat I spray some oxalic again round the waterline with a garden sprayer and get it white again, even though I think it takes off the polish.
My previous boat was Navy Blue, never saw this, though keeping a Navy Blue hull looking good has different problems.
My previous boat was Navy Blue, never saw this, though keeping a Navy Blue hull looking good has different problems.
