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Options for poly finish on a fabric top

 
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norwoodz



Joined: 13 Feb 2014
Posts: 10

PostPosted: Mon Jul 24, 2017 8:04 pm    Post subject: Options for poly finish on a fabric top Reply with quote

I'm working on a few test pieces with some cotton fabric. I don't have a place to spray, so I'm limited to brushed on finishes for now. So far I've glued down two different pieces with Titebond, laid down a couple light coats of white glue on top of the fabric, and am comparing clear coats. One I'm building up with polyurethane and the other with polycrylic.

From what I read around here, some folks like the polycrylic for the way it builds, but don't tend to use it as a top coat. So far, what I like about the polycrylic is that it builds and fills in the fabric quickly, it dries quickly so it doesn't gather as much dust as polyurethane, and it seems to be less prone to small sanding scratches showing through.

As far as durability of a top coat, am I correct in thinking standard polyurethane will hold up better? I'm wondering if I could use the polycrylic to build up a flat surface and then top coat with polyurethane. Would I need to let the polycrylic cure for a long time so I didn't trap any moisture under the top coat?
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gkyhn



Joined: 14 Sep 2005
Posts: 3207
Location: Central California

PostPosted: Tue Jul 25, 2017 7:19 am    Post subject: Reply with quote

Polycrylic is pretty tough stuff. I've done a fabric and a paper (Jack D labels) finish. Both of them were cleared with straight polycrylic. Both seem plenty tough.
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BrightKJ



Joined: 13 Sep 2008
Posts: 342
Location: Midlothian, VA

PostPosted: Tue Jul 25, 2017 10:15 am    Post subject: Reply with quote

You can also get a lot of build to bury that fabric with the gloss version of Mod-Podge, which is available in any craft store -- and is very cheap. It creates a very clear and durable coating. I used it on a fabric covered guitar a couple years ago with good results.
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ladyfinisher



Joined: 21 Feb 2013
Posts: 401
Location: California

PostPosted: Wed Jul 26, 2017 6:39 pm    Post subject: Reply with quote

I have used the Mod-Podge also. It worked fine. I have also read that somebody uses fiberglas resin.

Ladyfinisher
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norwoodz



Joined: 13 Feb 2014
Posts: 10

PostPosted: Wed Jul 26, 2017 10:20 pm    Post subject: Reply with quote

One guy recommended General Finishes water based topcoat. Looks like the same concept as the polycrylic with a little more cred in the woodworking community. Might have a go with that.

It's funny, the more you dig into reading about this stuff, for just about every finish-related product that exists, there's a number of people saying it sucks and is a total pain to work with, and then a number of people saying it worked fine for them and they really like it. Go figure.
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tvvoodoo



Joined: 31 Oct 2012
Posts: 53
Location: Canada, eh?

PostPosted: Fri Aug 04, 2017 5:12 pm    Post subject: Reply with quote

I suggest Modge podge is entirely too soft even when fully cured.
weldbond glue is good, water it down about 80% glue, 20% water gives you more working time to futz with the fabric.

Soak/saturate your fabric in the glue, rather than spreading it on the guitar, laying it down on the glue. Worked very well for me. But mask the sides before you do. do not be in a hurry to trim out cavity holes until you have a lot of layers - makes for easier and cleaner trimming.
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BrightKJ



Joined: 13 Sep 2008
Posts: 342
Location: Midlothian, VA

PostPosted: Fri Aug 04, 2017 5:27 pm    Post subject: Reply with quote

tvvoodoo wrote:
I suggest Modge podge is entirely too soft even when fully cured.
weldbond glue is good, water it down about 80% glue, 20% water gives you more working time to futz with the fabric.

Soak/saturate your fabric in the glue, rather than spreading it on the guitar, laying it down on the glue. Worked very well for me. But mask the sides before you do. do not be in a hurry to trim out cavity holes until you have a lot of layers - makes for easier and cleaner trimming.

The trick with ModPodge is putting it on in thin coats -- only then will it get good and hard.
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ladyfinisher



Joined: 21 Feb 2013
Posts: 401
Location: California

PostPosted: Fri Aug 04, 2017 10:32 pm    Post subject: Reply with quote

I read on another board that somebody used fiber glass resin for fabric. I can see where that might work really well if the colors don't bleed with it.

Ladyfinisher
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86runner



Joined: 05 May 2010
Posts: 2916
Location: Nashville, TN

PostPosted: Sat Aug 05, 2017 7:49 pm    Post subject: Reply with quote

I've used Mod Podge, and I had the opposite experience of it not getting hard enough. That stuff got so hard I could barely sand it!
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