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Old 10-24-2006, 06:43 AM
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SEM products

Hi Guys -

I recently purchased a can of SEM weld thru primer. I got the can for about $12 bucks from my local autobody shop. This was my first can of SEM that I've ever purchased.

Anyways, I went to go shake the can up and I had to shake it (literally) for about 40 minutes before the ball "broke" loose and started rattling around in the can. I shook the can for a good several minutes afterwards. I went to spray and all I got was sputtering from the can. I cleaned the tip with laquer thinner, gave it another good shake, and had the same problem. Every once in a while I'd get a nice even spray that would last about 1-2 seconds, then the stream would quit. I'd shake it for a minute of so, get a 1-2 second spray and have to repeat.

Fed up with this, I bought a NEW can yesterday, thinking maybe I got a bad can. I've got the EXACT same problem. Took about 40-50 minutes of shaking to get the ball loose, and CANNOT get an even spray whatsoever out of the can.

The paint can was probably 65 or so. Is this typical of SEM products? At 12 bucks a can, if this is the type of spray performance I can expect, I won't be buying SEM anymore.

Has anyone else had this problem? I suppose its possible that I got two bad cans, but....

Is there any other weld thru primer out there that anyone can recommend? I tried some stuff from NAPA and was not impressed. It sprayed on so thick, I couldn't get the MiG to even start and the resulting weld was not very good once I did.

thanks!

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Old 10-24-2006, 06:57 AM
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old product

sounds like what happens when a product sits on a shelf too long. try a different supplier?
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Old 10-24-2006, 07:13 AM
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It's most likely old. I had a can of lacquer primer thats been sitting for 6 mos. at least I guess that I wanted to use for a different color guide coat and it took a couple of min. shaking to get the ball to rattle but after another 5 min of shaking,it sprayed fine. The 65* "may" have something to do with it as well as most spray can paint recommends 70* minimum. I really sounds like it's just old product though.
As for a weld primer,I don't use it. I'm just an epoxy guy anymore.
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Old 10-24-2006, 08:28 AM
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There is nothing wrong with SEM products, I have used many different ones over the years with GREAT results. The problem you have is totally normal for a weld thru coating. That can has about 90% zinc, it is very heavy and will settle very bad at the bottom of the can. I have never seen one that requires that long of shaking so it may be VERY old and just beyond hope but I have never seen it before.

Sometimes you need to turn it upside down and spray it to blow out stuff in the pickup tube without pulling up anymore to just plug it worse.

AutoTech is my old favorite weld thru. But 3M's is very good and many others. Rubber Seal makes a "Weld thru Etch" primer that adheres better than your average weld thru which has very poor adhesion properties.

Here are some tips on using rattle cans. (Click here) read the link that is on that page for even more info.

Brian
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Old 10-24-2006, 09:00 AM
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Thanks Guys -

I guess I didn't want to imply that SEM products didn't perform, I'm more frustrated that I can't get the stuff to come out of the can and at 12 bucks a pop.... it tends to wrinkle my panties a bit

Maybe I'll take the cans back to see if I've got old product....

Joe
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Old 10-24-2006, 04:24 PM
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By the way, be sure to remove that weld-thru primer from the out-side surfaces before you prime. That stuff will definitely cause adhesion issues. I understand you don't want your seams to rust, but, I'm sure you want your paint to stick. So, only leave it in the seam where it belongs.
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Old 10-24-2006, 07:55 PM
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SEM's brushable weld through coating should be pulled from the market IMO... 3M makes the best welding coating available IMO-look for the purple labeled can.
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