Citric acid @ 20% Sent from my iPhone
> On Aug 17, 2015, at 1:11 PM, Jim Watts via CnC-List <cnc-list@cnc-list.com> > wrote: > > The heat of welding will change the physical properties of stainless, so he > may (probably did) use stainless rod but it's now less stainless. You could > try repassivating it with a product called "Wichinox". > http://www.defender.com/product.jsp?path=-1|10918|2303285|2303294&id=1819274 > > Davis FSR will remove the rust stains. If you want to use just the active > ingredient, it's oxalic acid. You can buy it as Wood Bleach at hardware > stores. > I'm not sure muriatic acid would be appropriate here. > > Jim Watts > Paradigm Shift > C&C 35 Mk III > Victoria, BC > >> On 17 August 2015 at 13:03, Joel Aronson via CnC-List >> <cnc-list@cnc-list.com> wrote: >> Muriatic acid will get ride of the rust stains. Sudbury Hull Cleaner >> contains it. >> >> My rigger welded my pushpit, but he is in Annapolis. Not sure what he used >> for welding rod. >> >> Joel >> 35/3 >> >>> On Mon, Aug 17, 2015 at 3:48 PM, Dr. Mark Bodnar via CnC-List >>> <cnc-list@cnc-list.com> wrote: >>> >>> Last year I had noticed a small crack in my rear pulpit tubing. >>> This spring before launch I hired a mobile welder to come out to the boat >>> repair the area - he had a tough time with the wind swirling and had to >>> repeatedly grind down the dirty weld to do it over. >>> >>> The final repair was adequate (pretty rough - but sealed the crack and >>> seemed solid). Unfortunately a few weeks later I discovered a million >>> little rust stains in the gel coat. We tried to scrub them out with Comet >>> - but mostly just brightened up the gel coat. CLR didn't seem to do much - >>> maybe a longer soak? >>> >>> Any suggestions on cleaning? I'm wondering about doing a bit of a white >>> wash with stain to see if that will clean them. >>> >>> Now the area he repaired is showing some signs of rust - obviously he >>> welded with steel and that is rusting. I had another weld that gave way (a >>> lower bracket on the rear pulpit) - and I'd rather avoid repeating the same >>> issue. Not sure how close to fiberglass they can safely weld - removing >>> the whole rear pulpit wouldn't be a fun process, but likely smart to get it >>> done properly. >>> >>> Any specific questions I should be asking of a stainless welder? >>> Recommendations in Halifax area? >>> I'm also wanting to build a small arch for a solar panel - maybe integrated >>> right into the rear pulpit >>> >>> Mark >>> CS 30 - Prosecco >>> >>> >>> _______________________________________________ >>> >>> Email address: >>> CnC-List@cnc-list.com >>> To change your list preferences, including unsubscribing -- go to the >>> bottom of page at: >>> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >> >> >> >> -- >> Joel >> 301 541 8551 >> >> _______________________________________________ >> >> Email address: >> CnC-List@cnc-list.com >> To change your list preferences, including unsubscribing -- go to the bottom >> of page at: >> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > _______________________________________________ > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go to the bottom > of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >
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