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Scraping spruce top http://mowrystrings.luthiersforum.com/forum/viewtopic.php?f=10101&t=56629	Page 1 of 1

Author:	Duct Tape [ Sun Jun 09, 2024 12:24 pm ]
Post subject:	Scraping spruce top
I’ve partially finished the bindings for three 00-12 cutaways, two with CA glue technique and one with a very stressed Tightbond application. Wouldn’t have been a big deal except for I had two top purflings, one a thin green veneer. Things got cumbersome . There’s now a good amount of dried CA glue on half of one spruce top side where I used too much CA. I’m not sure of the best way to clean it off. Scraping works well everywhere else but concerned about the softwood tearing out. I might just try to sand it flat with or without RO sander. Appreciate any advice. Thx Jon

Author:	DennisK [ Sun Jun 09, 2024 12:49 pm ]
Post subject:	Re: Scraping spruce top
Sanding would probably be easier. Put tape over the grit on one edge of the sanding block so you can slide it around flat on the soundboard surface but only remove material at the edge. Use a piece of paper to protect the top from any minor damage from the tape rubbing on it.

Author:	Alan Carruth [ Sun Jun 09, 2024 2:56 pm ]
Post subject:	Re: Scraping spruce top
Soft woods can be scraped, despite the opinion I saw in one widely used book of sharpening. The scraper has to be sharp, and with a light burr. Violin makers often avoid sanding altogether, to preserve the crisp edges of the work, but guitar makers almost always sand before finishing. Scraping a soft wood compresses the soft earlywood, and tends to remove more material from the darker latewood lines. Later on the earlywood takes up humidity and swells, producing a 'corduroy' effect. Since this what Strad did on his fiddles it's desirable, but guitar buyers prefer the flat look of a sanded surface. Scraping to remove the glue and level the surface, followed by raising the grain with water. and fine sanding to level, should get you there.

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