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Build project - resonator guitar from recycled bits

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Re: Build project - resonator guitar from recycled bits

Postby adrian_k » Sat Nov 16, 2019 7:02 pm

Oh and here's the case I'm going to use - an old, well used thing that Colin couldn't bear to throw away but could never use for a new instrument:

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That's it for this month!
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Re: Build project - resonator guitar from recycled bits

Postby Wonks » Sat Nov 16, 2019 7:38 pm

I'd have used nitro, basic drying times are similar and I'd have put more coats on before rubbing back. There's no single correct way to spray, so certainly carry on the way you're doing it.

But given your limited available spraying time, I'd have just added more layers without sanding. Then when you came back next month, you could have both sanded and polished on a cured finish.
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Re: Build project - resonator guitar from recycled bits

Postby Folderol » Sat Nov 16, 2019 9:36 pm

Nice to see this project is alive again, and props for sticking with all that sanding. I can't think of anything I hate more :thumbup:
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Re: Build project - resonator guitar from recycled bits

Postby blinddrew » Sat Nov 16, 2019 10:01 pm

The whole coating and sanding thing does get tedious pretty quickly, but it's the only way to get a good finish and there's really no shortcut.
Good to see a bit more progress. :)
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Re: Build project - resonator guitar from recycled bits

Postby adrian_k » Sun Nov 17, 2019 10:31 am

I don't mind the sanding, I do a lot of grunt work for Col when I visit so I'm used to it. Also can be very satisfying (yes I am weird).

Re the one coat vs many before cutting back question, as Wonks says there's no right way and in fact I think the manufacturer's guide for the AC lacquer says put three coats on at a time.

The reasons I am not doing that are: 1) I want to get as many surface imperfections out as possible before I get too much finish on, single coats early on really highlight where more work is needed; 2) my spraying technique ain't that good and I don't want to risk runs on runs that I then have to sand hard back anyway; 3) this is how Col does it after decades of trying different approaches and subjectively I like the finish on Col's guitars better than many that come in, more silky smooth to the touch, depth of finish looks better and less build up in the nooks and crannies like at the neck/body join. I accept I may be biased. ;)

Talking of imperfections I forgot this: When I cut slots into the guitar sides for the bracing I carelessly went too low on one of them. I put a small pad in to support the brace but it looks a mess from the outside. This was before the binding channel was cut, and its ended up visible below the binding. And of course it's on the upper bout where I'll be staring straight at it. So I filled it in with coloured wax, and I may just touch it up with a dark stain it to make it look more like dark grain:

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Re: Build project - resonator guitar from recycled bits

Postby Wonks » Sun Nov 17, 2019 11:23 am

I looked up one datasheet for AC lacquer and a) you should definitely be wearing gloves and have your arms covered when spraying and b) they say no coarser than 320 grit for between coat de-nibbing.
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Re: Build project - resonator guitar from recycled bits

Postby adrian_k » Sun Nov 17, 2019 12:16 pm

Fair point about the gloves but hey I'm old and I'm not going to be doing any more of this.

Re the grades - I'm not de-nibbing yet. The first two or three coats I can end up sanding a lot of it off as it uncovers problems. Once I'm happy with the surface I'll go to 320 (and from this point onwards try very hard not to cut through to the wood), then go 400, 600, 800 wet then finish on 1000 wet, then polish. But depending how it goes I might do more than one coat at any grade or (hopefully not) have to go back a grade. I'm happy to take it slow and steady anyway :)
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Re: Build project - resonator guitar from recycled bits

Postby Wonks » Sun Nov 17, 2019 12:46 pm

I'm more concerned that for heavier sanding you aren't letting the finish dry properly, which means that you are probably making things harder for yourself. With the finish still quite soft, the sandpaper is liable to tear out bigger 'chunks' (relatively) than if the finish was harder. So, you end up creating small pits than then need to be filled again etc. The two hours dry time for sanding is really for 320 grit and light sanding. For coarser grit I'd wait 24 hours, or the best part of. Also, any runs will be thicker and will take a bit longer to dry. I'd personally wait 1 or 2 days before sanding those down.
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Re: Build project - resonator guitar from recycled bits

Postby Wonks » Sun Nov 17, 2019 1:42 pm

You'll obviously get there in the end, but if Col wants you out fairly quickly, then more spraying and less sanding will get you there that bit quicker. It may sound like I'm having a go at you, but I don't mean to.
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Re: Build project - resonator guitar from recycled bits

Postby adrian_k » Sun Nov 17, 2019 1:55 pm

Your concern is noted and appreciated! :D and all input is welcome.

I also haven’t been very clear. The first two coats are left overnight. In fact I’d never go to two hours drying because despite what manufacturers say and working in a humidity and temperature controlled environment, it doesn’t always work out like that. But I might go to two sprays a day later i.e. 4 hours if things are going well.

But I’ve been doing the sanding bit for Col a few years now and this process does work. And though he might want me to finish, we both want a good result and this approach is proven. (Caveat - with this finish. Nitro, french etc all different).
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