Guypie Posted September 15, 2015 Share Posted September 15, 2015 Does anyone here use weld through primer when doing rust repairs? or everyone? is it necessary? I have started doing the rust repairs on my morrie, build thread will come when I have done enough to be worth posting about. Also if it is the go what brand do you use/where do you get it from? Seems kinda pricey but if it keeps the rust away... Cheers Guy Quote Link to comment Share on other sites More sharing options...
Nominal Posted September 15, 2015 Share Posted September 15, 2015 I use CRC Zinc spray usually. Can make welding a bit messy (MIG) but do-able. I spray any repairs as much as feasible, especially in closed sections. I really don't want to do rust repairs more than once. Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 15, 2015 Share Posted September 15, 2015 Use 2 part epoxy primer on the back of a patch and in between seams, you can brush it on. Use a flattened out drill to remove paint where you want to spot weld. If you let it cure overnight it handles the heat of welding better than any can stuff. 1 Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted September 15, 2015 Share Posted September 15, 2015 I use (and know others do too) normal zinc spray paint. Forget the brand. Doesn't seem to cause any issues with welding and the internet tells me it's good at anti rust. 1 Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 15, 2015 Share Posted September 15, 2015 Honest all you guys doing panel work should have 2 part epoxy primer in your shed. Put it on every metal surface, inside and out, this is the only way. 4 Quote Link to comment Share on other sites More sharing options...
Borgweiser Posted September 15, 2015 Share Posted September 15, 2015 I use Wurth weld through primer. It's lush. Quote Link to comment Share on other sites More sharing options...
mikey Posted September 18, 2015 Share Posted September 18, 2015 Heya Spence so you mix it up in a pot and paint it on with a brush yeah? Isn't clean-up a pain in the butt? Or do you just throw the brushes out afterwards? Quote Link to comment Share on other sites More sharing options...
Spencer Posted September 18, 2015 Share Posted September 18, 2015 Yes it will sit in the pot for several hours before setting, mix some up once your patches are cut and brush on, go have a beer and come back the next day and weld in. Nothing in a can comes close to the adhesion and durability of epoxy and it takes the welding heat like a champ. I sometimes throw the brushes away but gun wash (cheap generic solvents) are cheap as fuck, just keep recycling the old thinners and use it for the initial brush clean then a quick wash in clean thinners and the brush is clean for about 10c worth of product. If you are doing paint and panel work you should have a 20L of gunwash and wax and grease at your house also, it should be dirt cheap from a proper supplier. You are doing yourself/your car a disservice using can paint near any rust work IMO. EDIT: I also buy stacks of the mixing pots from the paint supply shop, sometimes I clean them up but usually throw away. A 4L can of epoxy (makes like 6L), some brushes and mixing pots will be cheaper in the long run by a massive margin, those $20 cans are a rip off. I used to use Wurth & the kiwi (blue can) branded one, they seem to just be some lacquer primer/paint with stacks of zinc or something, it still burns and the data sheets says you have to seal with epoxy anyway? Quote Link to comment Share on other sites More sharing options...
flyingbrick Posted September 18, 2015 Share Posted September 18, 2015 http://www.trademe.co.nz/950458676 Spencer what are ya thoughts on this stuff? Sounds basically like clear epoxy and nothing else special. Do you think it would work alright? 1 Quote Link to comment Share on other sites More sharing options...
mikey Posted September 18, 2015 Share Posted September 18, 2015 Nice one. Thanks. Yep I'm totally a believer in the epoxy primer thing. Nothing from a can come close to the durability, esp when painting over steel of dubious quality. Quote Link to comment Share on other sites More sharing options...
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