Difference between revisions of "AY Honors/Plaster Craft/Answer Key"
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< AY Honors | Plaster CraftAY Honors/Plaster Craft/Answer Key
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==2. Give the steps in pouring a plaster item and preparing it for painting. == | ==2. Give the steps in pouring a plaster item and preparing it for painting. == | ||
==3. Know how to remove air bubbles from a poured item. == | ==3. Know how to remove air bubbles from a poured item. == | ||
| − | + | Air bubbles are caused by the surface tension of the water mixed into the plaster. This surface tension can be eliminated by spraying a mold treatment such as [http://store.plastercrafters.com/aimosp8oz.html Airid] onto the mold before pouring the plaster. The mold treatment will reduce the surface tension and prevent bubbles from forming. | |
| + | |||
| + | You can also mix up some new plaster mix and apply it onto any holes in the finished piece with an artist's brush. Let it dry for an hour before painting. | ||
==4. Know how the setup time can be increased or decreased for plaster. == | ==4. Know how the setup time can be increased or decreased for plaster. == | ||
Revision as of 01:03, 23 April 2008
1. What is the principal ingredient of plaster of Paris?
Plaster of Paris is based on calcium sulfate which is derived from gypsum.
2. Give the steps in pouring a plaster item and preparing it for painting.
3. Know how to remove air bubbles from a poured item.
Air bubbles are caused by the surface tension of the water mixed into the plaster. This surface tension can be eliminated by spraying a mold treatment such as Airid onto the mold before pouring the plaster. The mold treatment will reduce the surface tension and prevent bubbles from forming.
You can also mix up some new plaster mix and apply it onto any holes in the finished piece with an artist's brush. Let it dry for an hour before painting.
