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  #21  
Old 04-03-2020, 09:32 AM
threepiece threepiece is offline
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Quote:
Originally Posted by elskeptico
That's helpful, thanks.

I've heard it's bad news to let cured body filler sit for a long time before being topcoated because it can absorb moisture. Is there truth to that, and is it true even if the car sits in a garage in a relatively dry environment?

I plan to do body work over a few months and then finally topcoat some time in the summer. I suppose I could do my filler, then spray everything again with epoxy before letting it sit too long.
Polyester body filler will absorb moisture. I have seen metal under it rust because water found its way to it. If you need to store the project for a while don
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  #22  
Old 04-03-2020, 09:33 AM
threepiece threepiece is offline
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Polyester body filler will absorb moisture. I have seen metal under it rust because water found its way to it. If you need to store the project for a while do not sand the filler. The vinyl coating on unsanded polyester filler will seal out water. You could also spray or brush some cheap paint or primer to seal it.

By the way the vinyl coating on unsanded filler will clog sandpaper. I used to scrape it off with a razor blade before sanding.
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  #23  
Old 04-03-2020, 09:43 AM
threepiece threepiece is offline
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I would also recommend practice, perhaps on more than just a fender. Materials are expensive, make the most of your practices time as possible. As you are practicing focus on developing a
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  #24  
Old 04-03-2020, 09:45 AM
threepiece threepiece is offline
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I would also recommend practice, perhaps on more than just a fender. Materials are expensive, make the most of your practices time as possible. As you are practicing focus on developing a good eye. Having proper light is important for this.

There are basically two things to focus on 1: color coverage and 2: smoothness or gloss

For checking coverage you want your eyes and the light perpendicular or near 90 degrees to the surface. This is most important when spraying metalic colors.

When checking for gloss place the light and your eyes low to the surface and look for rough spots. Practice these tips in a garage with one hand held light until you have developed some eye skill before you mix your practice paint. After this you will understand where are the best places to put your lighting.
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  #25  
Old 04-04-2020, 11:12 AM
Rusty76 Rusty76 is offline
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Thanks for the health warning. I have heard that this stuff is nasty.
I do have access to a detached garage to spray but not sure if this is even worth it.
Might have to rent a booth.

I will be in the same boat. Doing body work over a period of time.
I was thinking about spraying that 2k Epoxy stuff on the bits that I have completed.
Work on a front fender and after the filler has been sanded and its good to go I will spray 2k epoxy from a can. Eastwood has the stuff. I used it a little seems pretty good.

Like Babywag said maybe its not worth it due to the cash.
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  #26  
Old 04-04-2020, 11:22 PM
threepiece threepiece is offline
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Quote:
Originally Posted by Rusty76
Thanks for the health warning. I have heard that this stuff is nasty.
I do have access to a detached garage to spray but not sure if this is even worth it.
Might have to rent a booth.
Some of my best work was done outdoors. There are geographic differences in weather but around my neck of the woods mornings can be great for painting. There is an opportunity on many mornings before the bugs come out, wind starts to blow and direct sunshine that I found to be great for painting.

I would have everything ready the night before and the car or parts inside so there was no dew on them. The biggest issue I had was bird poop.
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  #27  
Old 04-05-2020, 10:35 AM
SJTD SJTD is offline
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One thing in favor of epoxy is it isn't as toxic as catalyzed urethane.
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  #28  
Old 04-11-2020, 08:51 PM
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rang-a-stang rang-a-stang is offline
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All this talk of epoxy got me thinking: It would be cool if you painted it with JB Weld...
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  #29  
Old 04-13-2020, 11:30 AM
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babywag babywag is online now
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Quote:
Originally Posted by rang-a-stang
All this talk of epoxy got me thinking: It would be cool if you painted it with JB Weld...

LOL
I believe lots of "bedliner" products are epoxy based. Have seen several folks that painted Jeeps with bedliner.
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  #30  
Old 05-27-2020, 12:15 PM
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elskeptico elskeptico is offline
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Recently I've run into lots of discussion of "ospho" rust treatment, and how to use it properly under epoxy and filler.

But why use ospho instead of just grinding away all the rust down to metal? Is it just used in cases where the remaining metal is very thin/delicate and/or places where rust is in a seam or other hard to reach area?
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