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Date Posted: 05/29/04 00:07:14
Author: Fabio Pisoni
Subject: Re: increase shellac finishing melting point
In reply to: Todd Burch 's message, "Re: increase shellac finishing melting point" on 05/28/04 22:21:05

Todd, first of all thank you so much for the time you spent to reply my question. I am aware that in our latitudes noone has ever faced the problem of increasing shellac melting point : shellac is already considered a good elastic and hard finishing product.
So I'll do my experiments over there on my next trip trying local product /resins. For exemple, I can find copal Pontianak (which for it's chemical features is not the best type copal in the world,but it's worth trying as it's important to use locally available products).
However, another way of investigation to solve my "finishing sticking" problem could be to apply a thin coat of NC varnish by cloth on top of my shellac finishing. Do you have any experience on this? Surfing on the net I found that some people reccommend the use of dewaxed shellad as under coat, others say that orange fine is good also, it's just a matter of preparing the surface properly avoiding sharp corners where finishing won't stick and pass fine steelwool on shellac before applying the NC coat. Personally I've never tried this as:
1) i thought that NC did not stick to shellac
2)I am afraid to apply NC finishing by cloth in an industrial production (if apply NC by brush it'd probably leave "strike marks" and our purpose is to keep our "shellac smooth look").
I can finish up with some wax ontop of NC.
Thank you again for your time. Fabio

>Fabio, this reply is from the Zinsser Company - the
>largest distributor of Shellac in North America (I
>have a local contact, so I forwarded your question.)
>
>"> This is to confirm my earlier email regarding a
>method for raising the melting point of shellac. The
>addition of another alcohol soluble resin may
>accomplish this, depending upon the melting point of
>that resin. We have not done any significant or
>quantifiable research here on that issue, so I can
>only speak in generalities. There are a number of
>natural alcohol soluble resins such as copol, rosin,
>sandarac and mastic. There are also a number of
>synthetic resins that will dissolve in alcohol,
>including certain acrylic resins. The compatibility of
>each of these resins with shellac as well as the
>melting point and hardness of the dry film are issues
>that the customer must explore in the course of his
>own experimentation. We wish him luck.>"
>
>Again, this reply is straight from the International
>Product Manager over shellac based products from
>Zinsser.
>
>Todd

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