Using Shellac as Adhesive in Wooden Boats

I got a call today from a company that builds wooden boats. They were inquiring about grades of shellac to use as a adhesive between the two wooden layers on the hulls of boats. This is a traditional use for shellac that has gone out of favor in the last 40 years with the advent of modern glues.
This call was spurred by an article in a wooden boat magazine ( I happened to see this article several weeks ago and made a copy of it), It seems like the use of shellac for this purpose could take off among the many small companys that build wooden boats.
Anyway, the man I talked to wondered what grade of shellac would work best. They want something with little refinement and something that is as inexpensive as possible as the need a very heavy cut for this adhesive.( Woodworkers use a 2 pound cut - he will use a 9 pound cut)
We discussed what would have better adhesive qualities for wood - dewaxed or waxy. I told him I thought dewaxed would work better. What do you think?
If waxy would be better, we thought he could possibly go with a seedlac. I told him about the debris involved and he didn't think it would be a problem.
Lately I have been wondering what I can do to increase the market for shellac and this discussion shows up as a real possibility. I am planning on advertising in this wooden boat magizine's next issue and continuing to look for further markets for shellac.

Comments

[Pravin]

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[Dan Robertson]

thing to do is a boil test
use multiple test subjects and a 9 pound mix
glue and clamp lightly for a few days and then test one piece to destruction
note how much force it took ( psi ) to break the joint apart
take pictures of the pieces were the glue broke apart
repeat every few days until you find out what the best cure time is for the greatest strength
then you can move on the the boil testing
if your interested in me doing this for you I can
just send me a few samples of various shellac's you think might be good as gluing compounds and I will make a detailed analysis
if it turns out favorably
you are going to sell so much shellac you wont know how to find enough of it

[Woodworking project plans]

Woodworking at home can be a fun and rewarding experience.

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