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holley
PostPosted: Sat Apr 30, 2011 10:39 pm 
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Walnut
Walnut

Joined: Sun Jan 30, 2011 9:29 pm
Posts: 3
First name: Charles
City: Broken Arrow
State: Oklahoma
Country: United States
Focus: Build
Status: Amateur
Hello! I have purchased a couple extera radius dishes from Luthier's Supply, and was wondering if I should back them up, or just shellac them as they are? And if they do need to be backed, what is the best way to go about it and maintain the contour? Thanks!
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JJ Donohue
PostPosted: Sun May 01, 2011 3:24 am 
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Brazilian Rosewood
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Joined: Mon Dec 27, 2004 3:50 pm
Posts: 4662
Location: Napa, CA
I backed mine with 3/4" ply. Good idea to seal the MDF radius dish with shellac.

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LuthierSupplier
PostPosted: Mon May 02, 2011 3:17 pm 
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Koa
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Joined: Sat Jun 24, 2006 12:41 pm
Posts: 975
Location: United States
First name: Tracy
Last Name: Leveque
City: Denver
State: CO
Country: USA
Focus: Build
Status: Amateur
You can back them if you want, but be sure to use a good flat mdf stock. It is not really necessary to back them, as we remove the case hardening from the flat side of the dish before cutting the concave portion. This is so you don't have a pringles potato chip after a few months. These should stay flat after many years if you keep them in a nice controlled environment. Like JJ said, a good couple of coats of shellac or lacquer should help keep them stable longer. Good luck and happy building!

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holley
PostPosted: Mon May 02, 2011 5:18 pm 
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Walnut
Walnut

Joined: Sun Jan 30, 2011 9:29 pm
Posts: 3
First name: Charles
City: Broken Arrow
State: Oklahoma
Country: United States
Focus: Build
Status: Amateur
Thanks for the replies! I'm gonna give 'em a few coats of shellac and leave it at that.
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