I should be getting my 26 T coupe back from the sandblaster this week. I have a few patch panels to install. I want to keep new surface rust at bay while I do the patch panels. I have heard about a weld through primer. Is this a good way to go? Can someone give me a brand name? Will this have to be removed for final painting? Do I need an etching primer first? I can fabricate and turn wrenches, but I don't know anything about painting. What is the correct procedure when starting with freshly sandblasted metal? I would appreciate any expertice you guys could give.
I've used Oxysolve in the past when I wanted the bare blasted steel to stay rust free while being repaired. A simple water wash and it's ready for primer. I think Eastwood still sells the product.
I like to do a mild blast mostly were ill be working … then do a final overall blast when done. But if that’s out id shoot it with epoxy and mask - avoid - or wire wheel it off the spots you need to work.
Just use zinc chromate in a rattle can if you don't have spray equipment. It will go on almost transparent and thin like dye but that's all you need at this point. Weld thru primer is very very expensive. As high as 50 bucks for a rattle can. Just a coat of zinc is all i've ever used. Use a resporator.
Just wipe it all over with metal prep until you are ready to start prepping for primer and paint - and wear gloves. I have done several cars that way and left them for years with no adverse effects and I know of professional metal shapers who use it too. I use Blue Lightning. You might need to do it more often in Humidiana.... www.blulightning.com/product/MPQT/METAL-PREP-RUST-INHIBITOR.html
I would tape off the spots I'm gonna weld on , prime everything else with epoxy primer, remove tape and use weld thru primer before welding on patches.but I just noticed that I'm a grenade inspector - I better get busy
Weld thru primer is for BARE METAL OVERLAP AREAS ONLY!. Use a self etch. or epoxy. PPG 1791/1792 is what I use.
Rust needs bare metal, moisture and oxygen to form. Some types of primers are better than others. Were talking about shop coats. In a shop environment, most any primer will hold off rust for years. Even epoxy is NOT WATER PROOF, as stated so often on this board. It's a corrosion RESISTANT primer. That means if you get a scratch or chip to bare metal, it will RESIST corrosion creeping under the primer. BTW sand the surface after sand blasting, prior to primer. I use 120-150.
duponts second line Nason makes a etching primer thats works really great and doesn't break the bank looks like zinic chromate just don't breath it.....way strong
When you plan to weld any sandblasted areas hit the weld seam area with a grinder to remove and gl***/sand that will mess up a weld. Bob
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