Hi Mark,
I use phosphoric acid ~ 50% and a "scotchbrite" pad to clean up rust
stains. I think the principle ingredient of CLR is a dilute version
of what I use so it might take more time. Scrubbing with the pad &
acid defiantly speeds things up, allowing you to rinse in less time
than a soak.
Any significant heat treatment (welding) on S/S will affect it's
protective oxide layer. To restore the affected area we use a
"pickling paste" which is just a fancy name for a really strong acid
thickened enough to hang almost vertical for a while doing it's job.
Copious amounts of water is recommenced to be on hand to get rid of it.
The best welding process for anything that cannot be removed from the
boat is shielded gas, TIG or MIG, not a fluxed electrode. A tad more
expensive but a much better job and no splatter clean-up.
If you have to go other and with any grinding keep the decks wet,
water flowing, around the work area. This will prevent hot stuff
sticking to soft stuff.
Cheers, Russ
Sweet 35 mk-1
At 12:48 PM 17/08/2015, you 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
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