I’m looking for tips on how to seal the edges of borg bought MDF to achieve a glass smooth paint finish. I’ve heard of mixing yellow glue & water. Are there alternative methods?
[OP]
Moderator
I’m looking for tips on how to seal the edges of borg bought MDF to achieve a glass smooth paint finish. I’ve heard of mixing yellow glue & water. Are there alternative methods?
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"It's paradoxical that the idea of living a long life appeals to everyone, but the idea of getting old doesn't appeal to anyone."
Andy Rooney
Contributor
I've used lightweight joint compound several times and it seems to work fine. Just smear it on with your finger or flexible plastic spatula, let dry, then sand. Inspect, repeat where needed.
John
"A hen is only an egg's way of making another egg".
– Samuel Butler
Moderator
+1. Shellac is perfect for this.
[OP]
Moderator
I’ve tried Zinsser spray on shellac and it never has worked for me, maybe I needed more coats. I’m going to try the joint compound and see if that works on some small signs for my daughters church.
"It's paradoxical that the idea of living a long life appeals to everyone, but the idea of getting old doesn't appeal to anyone."
Andy Rooney
The spray shellac, while handy to have around, has never really been a replacement for Seal Coat in my shop. I use it for many things. A shellac primer like Zinsser BIN may do two jobs at once for you prior to painting.
"A hen is only an egg's way of making another egg".
– Samuel Butler
Moderator
Something that's now on my radar for this kind of thing as well as grain filling on guitar bodies is Z-Poxy.
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The most expensive tool is the one you buy "cheaply" and often...
Contributor
Jim - this is a new one to me. Can you tell us a bit about your experience with Z-Poxy?Originally Posted by Jim Becker
Moderator
I just bought some to work with, but the guitar building crowd raves about it. It's designed for grain filling as well as a thinner clear surface. It sands out nicely. It's not hugely expensive to try...available on Amazon. I have a sapele guitar body I'm going to do "first use" on with the product shortly.
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The most expensive tool is the one you buy "cheaply" and often...
Contributor
BIN primer has worked very well for me for this purpose. If the MDF is low grade like the box stores sell, you might have to apply it, sand back, and apply it a second time. BIN sands very well and it is shellac based by the way.
Member
Which z-poxy are you refering to ? They have about 4-5 different kinds.
Moderator
Here's the one I purchased for my shop...
https://smile.amazon.com/gp/product/...?ie=UTF8&psc=1
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The most expensive tool is the one you buy "cheaply" and often...
Contributor
Does shellac really seal the edges?
John
Contributor
I have used Zinsser's Sealcoat and wipe-on poly.
Ken
So much to learn, so little time.....
Member
I can't answer for Glenn but I've done the same. Shellac sealed the edges but it took multiple coats. Just kept at it until it looked right.
And the magical BIN primer also worked.
Don't sweat the petty things and don't pet the sweaty things.
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