Water seal will not seal a porous surface or act as a bonding agent to increase the adhesion of plaster. Paint can be applied to water sealers but the drying time of the sealer itself is the most important part of this task.
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However because certain types of painted finishes are subject to duress a wood sealer can help prolong the life of the finish.
Can you use thompsons water seal on a painted surface. Water seal can only be used on bare and uncoated brick stone or concrete. For best results prime the water sealed wood first. You do not need to seal most types of painted wood with anything.
You can apply some of thompsons water seal products to damp wood but some of the other products require the surface to be dry for 48 hours prior to staining. Dried overspray can be removed with paint thinner or mineral spirits following manufacturers safety recommendations. The key is to read the labels carefully before choosing which thompsons water seal is right for your water damage protection project.
But as noted by others it will cause a failure for other top coats. Wet overspray of product can be removed by flushing immediately with water. Can you use thompsons water seal on a painted surface.
Do not use in below grade application where water pressure is a problem or on painted or recently stained surfaces. Thompsons water seal is forumlated for outdoor use. However dont paint an oil based over a latex paint.
It may not be the best thing to use on an interior wall. But as noted by others it will cause a failure for other top coats. Use either a latex based or an oil based primer as your first coat of paint before applying the finishing coat.
The hydrophobic properties of water seal will negatively affect the adhesion of any paint applied over it. Yes you can paint over thompsons although thompsons does recommend a waiting period. I dont believe any extra waterproofer is needed.
Do not use as an additive to paint. It may not be the best thing to use on an interior wall. You can always paint latex water based over an oil based paint as the latex just dries on the surface.
How to paint over water sealed wood. What to use to seal painted wood in the outdoors ehow.
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