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Building Tips and technical articles. => Paint and finishing => Topic started by: Fred Quedenfeld jr on September 02, 2019, 05:40:12 PM
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Brodak nitrate than brodak white primer?
Let it sit over night between coats?
Primer was no thinner
Fred Q
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Brodak nitrate than brodak white primer?
Let it sit over night between coats?
Primer was no thinner
Wow! That's a real mess, I haven't seen anything like that with dope before.
Brett
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Something was incompatible or contaminated. I'm with Brett, never seen that before with lacquer unless over an incompatible base.
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Something was incompatible or contaminated. I'm with Brett, never seen that before with lacquer unless over an incompatible base.
People have told me to watch out for various types of Brodak dope from different batches, but I certainly wouldn't have expected this.
Brett
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I have had that happen with latex but never "dope". ~^ Looks like it did not bond or dried before it could and shrunk about 10 times what it should have. Have you considered doing the entire plane in that pattern? It would surely be original! LL~
Ken
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I have had that happen with latex but never "dope". ~^ Looks like it did not bond or dried before it could and shrunk about 10 times what it should have. Have you considered doing the entire plane in that pattern? It would surely be original! LL~
Ken
If only Fred had thought to make the underlying paint candy red!
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I've seen paint do this that was well past it's shelf life. Not enough solvent and laid on too thick. I would sand it all off, it just didn't stick. Maybe try again thinned 60/40.
Motorman 8)
That fits with Fred mentioning no thinner.
Fred, let us know how it works out! This is certainly something I want to avoid in my paint jobs!
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That fits with Fred mentioning no thinner.
Fred, let us know how it works out! This is certainly something I want to avoid in my paint jobs!
Everyone was asking why I recommend 2-part epoxy paint, this is why.
Brett
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I sanded it all off several 80 and 100 grit sheets
the tissue peelled off
Applied water base primer and white color and is much better
The Brodak dope was over 10 years old new thinner with the nitrate
I tried it again on a Sunny hot day and it seems OK red not white
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FWIW I made the mistake of trying out Brodak's White Primer once, shooting a good solid coat on an All American. I've never used nitrate on anything, I've never felt a need for it. In my case the primer was sprayed directly over their butyrate clear. It didn't crack up or anything like your above photo but I did find it EXTREMELY hard to sand and also VERY heavy. Because of the difficulty in trying to sand it off I eventually gave up and ended up leaving about 98% of that coat on the model which added a ton of weight. I promptly threw the remainder in the trash to make sure I'd never be tempted to try it on something else. I've always had excellent and consistent results with all other Brodak (Randolph) dopes but I'll never use that primer again.
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What do you use for filler? Do you mix zinc stearate with the epoxy paint?
Someone already did that for you, that's what the primer consists of. Note the previous post about stirring up "part B" of Klass Kote, because the filler is actually in with the catalyst - the "part A" has some white or gray toner, and at least some people have assumed that this is all there is. The filler part is about half the volume of the catalyst can, and certainly stuck in a solid lump at the bottom.
Brett