tristanh
Part of things
Routinely bewildered
Posts: 990 
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May 28, 2017 20:43:43 GMT
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Are there any commercially available spray on "weld through" type primers, that actually don't get burnt off by welding? I'm just thinking of when you do repairs on the likes of A or B posts etc, places it's hard/impossible to get behind after to paint or protect.
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Whether you believe you can, or you cannot, you're probably right.
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shin2chin
Part of things
Making curse word cars slightly better
Posts: 820
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Halfrauds sell a rattlecan weld thru primer which I seem to remember worked for me.
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1977 PORSCHE 2.0na 924
1974 VW Beetle 1600
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bstardchild
Club Retro Rides Member
Posts: 14,893
Club RR Member Number: 71
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Weld through primers? bstardchild
@bstardchild
Club Retro Rides Member 71
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May 29, 2017 16:50:47 GMT
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Are there any commercially available spray on "weld through" type primers, that actually don't get burnt off by welding? I'm just thinking of when you do repairs on the likes of A or B posts etc, places it's hard/impossible to get behind after to paint or protect. Cavity wax on a flexible lance should be loads of ways to get good coverage into A or B posts Use a decent one rather than wax oil which doesn't seem to be anything like as good as it used to be |
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May 29, 2017 17:00:26 GMT
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I've used Bilt-Hamber products and been very pleased with them. Does what it says on the tin/box/can. www.bilthamber.com/ |
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Needs a bigger hammer mate.......
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May 29, 2017 17:50:10 GMT
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+1 for Bilthamber.
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May 29, 2017 18:00:10 GMT
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I used a brush-on one, mainly because I only wanted to paint it in the parts where two panels are spot-welded together. I just find aerosols go everywhere and waste a lot. I also found that the MIG wouldn't weld through it - I had to scrape it back to clean metal once I'd got the holes there and the panel clamped in place. Only a little bit, just so the MIG will start, and once it's going it stays going.
I think Halfords sell the U-Pol one.
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May 29, 2017 21:03:36 GMT
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The nature of any primer other than epoxy i that it will actually wick moisture out of the air, hence I question the validity of any of the weld-through primers. The sell is that they contain zinc that will act as a sacrificial anode and save the panel from rust.
I do know that the stuff contaminates the weld. Don't even think about using the stuff when TIG welding. What I find works best is an abrasive roll that I have that is the same diameter as the holes I use for plug welding (1/4"). Coat your panels with whatever you think will preserve them best, ( paint, epoxy primer or weld-through primer) then use end of the abrasive roll in the drill to clean out the bottom of the spot-weld hole.
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tristanh
Part of things
Routinely bewildered
Posts: 990
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May 29, 2017 23:18:41 GMT
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Thanks guys. I've been using aerosols, bought in the local co-op, called Galv Spray. It's aimed at farmers repairing gates etc.
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Whether you believe you can, or you cannot, you're probably right.
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The idea of a weld through primer is to protect the metal from rusting after it has been blasted or sanded because and whilst the bad area is being welded as it will start to rust as soon as its stripped, you still need to recoat the welded area.
It just saves priming the item to protect it then having to sand it back for welding later.
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Last Edit: Jun 10, 2017 8:55:42 GMT by Deleted
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