Replies

1. 
   RLMillard | Mar 25, 2002 06:48pm | #1

   I varnish all my pieces, that will have something set on them, because as you noted shellac is not very durable (for tops etc., but great for everything else). I apply one or two coats of dewaxed shellac and allow this to dry a day or so. Then I lightly scuff sand, and apply full strength Rock Hard Varnish over the shellac. I have yet to have a problem on the nearly 3 dozen pieces I’ve finished this way. I think the key is to use dewaxed shellac, and to apply it thinly.

2. 
   Danford_C_ | Mar 25, 2002 06:59pm | #2

   Matt,

   Offhand, I can't think of any finish you can't put over shellac.  Most of the varnishes that I am familiar with do have varying degrees of an "amber" tint and have a high gloss. 

   Some polyurethanes, however, have varying degrees of sheen and some are "clear".  Not knowing what the piece is, wood type, the type of shellac, i.e. super blond, blond, etc. nor the "look" you want, I'm reluctant to make an actual recommendation.  Regardless, the piece will darken over time, unless it's Walnut; it will lighten...

   Dano

   "Form and Function are One" - Frank L. Wright
3. 
   jonsherryl | Mar 25, 2002 08:22pm | #3

   Matt, some varnishes (usually of the polyurethane, polymerizing type) caution against application over shellac. I'm not a finish chemist, but I believe it has to do with stearic acid (fatty acids) in the varnish formula. Personally, I use varnish over shellac all the time and have yet to encounter a problem...However, I seldom use the polyurethanes. They are so hard as to be difficult to rub out between coats. I much prefer the old mineral spirit based alkyds. Anyway, I think if you check the label on the varnish you buy and avoid those that mention stearates, you'll be okay.