Paint, body question.
Lead Driver
Joined: Aug 2006
Posts: 8,093
Likes: 653
From: Brentwood, TN
"SEM Paints 39783 SEM39783 Weld-Thru Primer
Eliminates corrosion that forms between welded substrates. 39783 has a zinc enriched formula that minimizes the heat zone that is caused during welding, while reducing distortion and welding splatter."
For instance, if I am welding in a patch panel on a cab, fender, etc where I cannot gain access to the back of the panel, I will coat the patch panel with weld-thru primer before I tack it in place. After the repair I will do my best to shoot some paint or undercoating or POR-15 into the void to help seal off the weld bead and any other exposed metal.
Senior User
Joined: Feb 2011
Posts: 114
Likes: 0
so heres a question I have been doing some metal prep on my 55 , trying to get it to where I can get some primer on the cab , and was just wondering can you paint over the old primer and still get a good bond between the different paints ? I have sanded 90% of the inside cab and there are still some spots that dont have rust but still have old primer , these spots are areas that are hard to get to > Does everyone sand it down to bare metalor just spots that hav rust issues? Sorry for posting here but couldnt find anything elsewhere
Welder User
Joined: Feb 2009
Posts: 5,269
Likes: 50
From: northwest MT
I'm a big fan of good weld thru primers.....they work great in those hidden areas as CharlieLed says. Just don't try to weld ON the primer, you will have very poor welds. I always grind it off of the weld area. It is designed for the back side of the repair.
Sometimes if I have areas that need primer but are hard to spray, I will mix up some primer and brush it on. Works just fine in areas that you don't see.
Sometimes if I have areas that need primer but are hard to spray, I will mix up some primer and brush it on. Works just fine in areas that you don't see.
Senior User
Joined: Dec 2011
Posts: 175
Likes: 0
From: New Kensington PA
Paint gun filter
I used a disposable filter on the gun. It takes out any water that may be in the tank or line. I have a regulator with a water separator on it but I still use the extra filter. A few extra drops of water being removed will help you. I use PPG paint for my projects.
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JacandJlo
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
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Apr 16, 2011 03:51 PM
