Filler on bare metal

JimKueneman

JimKueneman

Mopar Nut
So after seven years of doing this, I’ve got trained like a monkey that filter goes on top of epoxy. My thoughts on that were basically you’re trying to seal the backside with the primer so that you don’t get moisture intrusion from the backside. What about something like a dog house? I will get up all those holes and IMy thoughts on that we’re basically you’re trying to seal the backside with the primer so that you don’t get moisture intrusion from the backside. I welded it up all those holes and it just seems like a waste of step to shoot it do filler, and then shoot it again for this. Is there other reasons why I would want to continue with the same process or can I just put filler on the metal and primer the whole thing?
 
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I don't have a definite answer but why skip a step? You've done so much work, why not do it just for a piece of mind? You get one shot to do it right the first time.
 
So if I'm reading your post right this is for a doghouse? Filler over metal is done all the time. Even on some high end stuff. Is it ideal? No but you can do it and it won't be a ticking time bomb. Especially in a low humidity environment like yours and if you epoxy fairly quickly over it. You want at least 80 grit scratches on metal, rougher is better if you can. 50 grit or coarser on the metal is good. Do your filler work, prime(epoxy) soon after. I would have no problem doing something non automotive that way.
 
Chris_Hamilton said:
So if I'm reading your post right this is for a doghouse? Filler over metal is done all the time. Even on some high end stuff. Is it ideal? No but you can do it and it won't be a ticking time bomb. Especially in a low humidity environment like yours and if you epoxy fairly quickly over it. You want at least 80 grit scratches on metal, rougher is better if you can. 50 grit or coarser on the metal is good. Do your filler work, prime(epoxy) soon after. I would have no problem doing something non automotive that way.
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I think he means the A100 engine cover aka doghouse. :). I would want max adhesion due to heat and vibration.

I don’t think he would build a doghouse for that craycray dog of his… :D
 
dhutton01 said:
I think he means the A100 engine cover aka doghouse. :). I would want max adhesion due to heat and vibration.

I don’t think he would build a doghouse for that craycray dog of his… :D
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I don't know if Jim's going to put this one together to OEM specification but, I would seriously consider using some of the better sound and vibration deadening mat insulation on the market, like Dyno Mat or many others available for the Dog House.
 
Chris_Hamilton said:
Oh, I thought he was talking about a real doghouse. Doh!
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I may have.


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shine said:
filler popped off of metal always has rust under it.
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thats what we found on this pick up body. started sanding and those tell tale cracks became visable. we scraped all the filler off, many rust spots. not bad, but enough to loosen the filler.
 
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