Neil 35 Posted April 17, 2016 Share Posted April 17, 2016 Any experts out there on how best to tackle this kind of staining? Any help, suggestions much appreciated... Quote Link to post Share on other sites
Black Panther 1,592 Posted April 17, 2016 Share Posted April 17, 2016 Toilet bowl cleaner then a good wax to seal it up. Quote Link to post Share on other sites
John B 106 Posted April 17, 2016 Share Posted April 17, 2016 The expensive way is T jett teak brightener, but there are other spray on products in smaller packs and cheaper.Just ask at the chandler. I have the brightener , so I use that once a year. But you do need to wash it off and then wax it. Quote Link to post Share on other sites
funlovincriminal 163 Posted April 17, 2016 Share Posted April 17, 2016 Have you tried this Neil? - Seems made for the job 2 Quote Link to post Share on other sites
SloopJohnB 322 Posted April 17, 2016 Share Posted April 17, 2016 and something my wife does not have........elbow grease. Quote Link to post Share on other sites
Kevin McCready 83 Posted April 18, 2016 Share Posted April 18, 2016 I raised my antifoul ~100 mm. Quote Link to post Share on other sites
all fired up 6 Posted April 18, 2016 Share Posted April 18, 2016 In the past I have used a dilute Oxalic Acid, and wiped it on with a sponge mop. For a more expensive solution I have also used GRUNT - Emergel, rust, stain and oxidation remover. a.f.u Quote Link to post Share on other sites
Island Time 1,239 Posted April 18, 2016 Share Posted April 18, 2016 AFU has the answer. That stain will dissolve with no elbow grease at all. Buy some Oxalic acid powder from Bunnings for under $20. It will last you for years. this is what the active ingredient in Grunt etc is. Use 2 teaspoons of it in a 1/2 litre of water, and wet a cloth. Use gloves. Wipe the damp cloth over the stain, and give it 5 mins. You really will be amazed! You can hose the area when finished. It is a good idea to polish the area with a quality canuubra (sp?) car wax, or the stain will come back sooner. Quote Link to post Share on other sites
John B 106 Posted April 18, 2016 Share Posted April 18, 2016 I think that's what is in the teak brightener too. 30 second, spray and walk away, maybe even 10 second , no elbow grease , will stain the antifoul at waterline. Quote Link to post Share on other sites
wheels 543 Posted April 18, 2016 Share Posted April 18, 2016 Oxalic Acid is what is used in Timber cleaner/brightners, Wooden deck cleaners and etc etc. Quote Link to post Share on other sites
ScarecrowR31 8 Posted April 18, 2016 Share Posted April 18, 2016 Rhubarb! Quote Link to post Share on other sites
harrytom 648 Posted April 18, 2016 Share Posted April 18, 2016 I used burnsco waterline stain remover lasted 12 months Quote Link to post Share on other sites
Neil 35 Posted April 18, 2016 Author Share Posted April 18, 2016 Thank you all. Oxalic Acid it'll be... Quote Link to post Share on other sites
Tim C 23 Posted April 21, 2016 Share Posted April 21, 2016 I've used many of the products above, but have had the stain return relatively quickly, despite trying various waxes. Note this is on two part polyurethane paint, not gel coat. Six months ago clear coated my boat with Nyalic by roller, and to their spec. The brown stain stayed away! I'm most impressed by the product. Not cheap, but effective. (The usual disclaimer here of having nothing to do with the company mentioned, just recommending a good product) Quote Link to post Share on other sites
Island Time 1,239 Posted April 21, 2016 Share Posted April 21, 2016 Hi Tim, yeah, I've tried it, but in my case I found that it broke down in UV after about 2 year and looked crap... Hope yours lasts better! Quote Link to post Share on other sites
1paulg 17 Posted April 21, 2016 Share Posted April 21, 2016 Nyalic when it breaks down is a nightmare to deal with as well. Quote Link to post Share on other sites
Tim C 23 Posted April 22, 2016 Share Posted April 22, 2016 Well I was getting down to two weeks before the brown stain returned after the Oxalic acid treatment, and following with a wax. If you look at the bows of many boats in a bay there are many with brown stains. Somedays I'm not sure marine paint has improved over time... Quote Link to post Share on other sites
wheels 543 Posted April 22, 2016 Share Posted April 22, 2016 I don't think it's the Paint that's the problem Tim. There's something in the water Actually, it would be interesting to get an analysis of the surface and see what it really is. It could be simply a slime/algae, or it could be something washed off our roads now we have different emission controls on vehicles, or it could be a mineral or similar from Soil washed off the land from all the new work around Auckland. Perhaps even a "tea stain" from tannin's from vegetation. Quote Link to post Share on other sites
Island Time 1,239 Posted April 22, 2016 Share Posted April 22, 2016 It's worse on old paint/gel coat though. I reckon related to surface permeability? Quote Link to post Share on other sites
ScottiE 174 Posted April 22, 2016 Share Posted April 22, 2016 Surely a decent waxing of the hull every year is the best answer. I recall Mr Marine would do this religiously every year with Double Diamond and she always looked mint. Quote Link to post Share on other sites
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