Weld Through Primer

admin

I know 3M and Krylon make these types of primers and I have not been able to fuind any of it locally.   Anybody know where I can get the stuff in an spray can?  I found a gallon but need a small amount?    Thanks
Reply:I've seen the krylon at hardware stores but I'm sure that's hit and miss. They don't usually carry things that don't move well. Check with some auto body shops and see if there is a local paint store that mainlines in the auto body side of the fence. So anyway, think auto body more than welding. It's more popular in that arena than GP welding. If you are using solid wire and gas (gmaw) get ready to be disappointed.
Reply:I'm welding a set of subframe connectors on a car and want to spray the area to avoid corrosion of the bare metal later.   Was recommended on the site that showed the connectors.I'm using solid wire and C25...    Why the potential disappointment?Any feedback is greatly appreciated.Rob
Reply:Primer does not protect against rust. Primer then paint, but don't leave the primer on by itself.
Reply:Of course everything is subject to every individuals perception but,,,,,, ...Most any decent primer isn't really gonna be an easy weld thru. Most of the affordable off the shelf weld thru's are a blend of weld thru (heavy etch & heavy zinc) and a so-so primer. The really good weld thru's run about 30 bucks for the tall rattle can. Most weld throughs work pretty well if you're running stick which has the necessary arc force to blow it out of there. That may not be what you want for your application. Maybe if you're doing 3/16ths or 1/4 where you can crank it up, not sure. If you aren't doing a lot what I do for long waiting periods on hit and run projects is a light primer, then go back in with a small brush, like a tooth brush, acetone and just clean that little swath you want to weld. Here's a semi interesting read. http://www.autobodystore.com/forum/a...hp/t-1351.html
Reply:I found some of the U-pol for $16 a can.  Thanks for the heads up on the stuff.  Glad i didn't spend $30 on the 3M stuff.
Reply:Originally Posted by crackedbackI found some of the U-pol for $16 a can.  Thanks for the heads up on the stuff.  Glad i didn't spend $30 on the 3M stuff.
Reply:Make sure to post a follow-up as a product evaluation for the rest of us!!
Reply:Does it work well with TIG welding? (weld-through primers in general), I've used it with MIG with good success.  The clean weld TIG thing always made me shy-away from using it.
Reply:Originally Posted by crackedbackI'm welding a set of subframe connectors on a car and want to spray the area to avoid corrosion of the bare metal later.   Was recommended on the site that showed the connectors.I'm using solid wire and C25...    Why the potential disappointment?Any feedback is greatly appreciated.Rob
Reply:eastwood has it
Reply:Originally Posted by ed maceastwood has it
Reply:Weld thru primer is applied to pre-primed plate.Pre primed plate is the best if you are working outdoors.Pre primed plate is used in the boatbuilding industry. It is very labor saving because when the boat hull is ready for sandblasting only the welded areas need blasting.The pre primed plate is well worth the extra cost.Just cleaning up all the sand is a real chore.TIG is not suited for welding thru primer. The burning gases can cause the arc to wander.AWS certified welding inspectorAWS certified welder