Leaving your garage sheet rock unsealed and unpainted leads to deterioration of the paper and plaster in the wall board. Over time the sheet rock paper will turn yellow and the plaster will crumble. Here are the steps to stop that deterioration.
- Prime the yellowed sheet rock with oil based Kiltz. This is a stain killer that will stop the yellowing paper from bleeding through the paint.
- Apply any exterior latex or oil finish paint over the Kiltz.
- If the sheet rock has not turned yellow, you can seal the wallboard with a latex based exterior primer.
- The finished coat can be an exterior latex or oil based paint.
