Plaster of Paris is produced by the grinding of gypsum and subsequent heating to 150C to get rid of water. For this recipe, any plaster without additives {resins} can be used.

1. Put a measure of plaster in a pot and add so much water as will prevent the gypsum from setting, ie. gypsum milk.
2. Keep stirring for about an hour.
3. Stir every hour for the whole day.
4. Stir once a day for the whole week.
5. If necessary, add more water so that it stays withing the consistency of creamy milk.
6. Apply all over the violin, using a brush.
7. Before it sets, wipe off with a towel trying to remove as much as possible rubbing it at the same time into the pores. Great care should be taken especially with the edges of the plates and the areas of the scroll where most of the end grain is.
8. Let it dry, don`t be alarmed at the plaster-like looks of the instrument at this point.
9. Put on a layer of a colorless oil varnish, let it sink a little and wipe off the excess so that no visible varnish remains on the surface. If you are too late with the wiping off, there is a danger of blotches.
10. If necessary, apply to difficult end grain parts more gypsum and wipe off again.
11. The violin will now look downright ugly.
12. If necessary, repeat the whole process {including varnishing} where needed. The whole surface of the instrument must be sealed.
13. Let dry thoroughly and you are finished.
14. The remaining plaster can be left to dry to be used on the next instrument. Just add some water before using it again.

Category: Varnishing