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Sanding after Zpoxy http://www.luthiersforum.com/forum/viewtopic.php?f=10101&t=49999 |
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Author: | Duct Tape [ Tue Nov 28, 2017 9:23 am ] |
Post subject: | Sanding after Zpoxy |
After reading around and watching several videos I can’t find a consensus. Do most folks sand back down to wood after zpoxy filler, leaving pores (hopefully) filled, or just scuff sand and then move on to shellac coat and/or finishing? Thanks Jon |
Author: | jfmckenna [ Tue Nov 28, 2017 9:31 am ] |
Post subject: | Re: Sanding after Zpoxy |
I learned the epoxy fill method when learning about French Polish from Milburns somewhat famous tutorial. He filled the traditional way with pumice till he discovered how good 5 minute epoxy works. Anyway he sands or scrapes back to wood. I only ever have done it once on a Uke but I sanded back to wood. It seems to make sense to me. It's pretty much the way a traditional oil based filler would work. You fill and try and scrape as much off as you can then sand away back to wood leaving the pores filled. I think there are two ways to skin this cat though. Because a lot of folks strive to keep a thin epoxy layer on so that the epoxy is basically a base coat. |
Author: | bcombs510 [ Tue Nov 28, 2017 9:55 am ] |
Post subject: | Re: Sanding after Zpoxy |
If you sand back to wood you lose the grain pop that something like Zpoxy provides. So if you want that grain popping warm amber under your finish then leave a thin coat on. Otherwise take it back to wood. Just make sure you do one or the other. If you accidentally sand through on a small spot it will stick out like a sore thumb. Ask me how I know. |
Author: | Freeman [ Tue Nov 28, 2017 11:53 am ] |
Post subject: | Re: Sanding after Zpoxy |
I use Zpoxy whenever I want to really pop the grain. I usually put one or two coats on and sand back to the wood, then another coat that was thinned with denatured alcohol. I try to leave this as the first finish coat. This guitar has Zpoxy fill and waterborn finish (KTM-9) |
Author: | J De Rocher [ Tue Nov 28, 2017 1:17 pm ] |
Post subject: | Re: Sanding after Zpoxy |
I do basically the same as Freeman. Two to three coats (depending on the pores) squeegeed on and sanded back to wood after each coat. Then a final wiped-on coat of z-poxy diluted 1:1 with alcohol to highlight the grain. |
Author: | James Orr [ Tue Nov 28, 2017 1:53 pm ] |
Post subject: | Re: Sanding after Zpoxy |
bcombs510 wrote: If you sand back to wood you lose the grain pop that something like Zpoxy provides. So if you want that grain popping warm amber under your finish then leave a thin coat on. Otherwise take it back to wood. Just make sure you do one or the other. If you accidentally sand through on a small spot it will stick out like a sore thumb. Ask me how I know. I was going to share the same thing. One of the things I love about Z-poxy in particular is the color pop I get from it. Due to that effect, I don't sand back to bare wood. I level it with 400 grit or something finer. If I sand through I do the thin wash coat of a 50/50 mix of epoxy to alcohol. |
Author: | Joe Beaver [ Tue Nov 28, 2017 3:09 pm ] |
Post subject: | Re: Sanding after Zpoxy |
I put on 2 coats for small pore wood and 3 for bigger pores, over bare wood. I space the coats as close together as possible, meaning I put another coat on as soon as the previous is hard enough to handle (better bonding between coats). Level sand once fully cured , maybe three or more days, then if the finish is nitro I start with vinyl sealer followed closely (an hour or so) with nitro. If the finish is going to be waterborn I just follow the cured epoxy with finish, no shellac. |
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