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In preparing our home for repainting, we have experienced a problem. When washing the house with TSP,bleach and water, this solution when applied to areas that were repainted a year ago with Benjamin Moore paint, causes the paint to bubble. This blistering occurs after rinsing the solution off. Once it dries, it appears to lay back down and it re-adhears. The surface underneath the Ben Moore was painted many years ago using Olympic Overcoat. The Olympic Overcoat does not bubble up or blister. When the cleaning solution drools across a piece of siding with it contacting both the old Olympic finish and the Ben. Moore finish, only the Ben Moore bubbles. Bleach and water alone does not cause blistering.
Is this normal? We are using real TSP by Savogran.
Does anyone know what is going on here and what should be done to prepare the surface for another coat of paint? What should we do about the areas that have re-adhered?
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Kevin:
I am a painting contractor in Kansas City.
Actually, it sounds like you have an interior moisture problem.
If possible, check for moisture content inside. You can look for clues in the attic. Look at the end of the trusses, where the insulation meets the roof sheathing. There should be space there to allow for moisture to pass up from the walls into the attic & out through the gable vents or roof vents. You may need to add soffit vents or gable vents to allow moisture to escape.
There are also two types of siding vents: Wedgevents are small wedges that slip underneath existing lap siding to allow slight air flow and moisture passage. The other type is actually a small 1" diameter circle aluminum vent with screening on the back. These are inserted into small cutouts in the siding.
I have seen this same problem on 3 occassions and all three were attributed to interior moisture not being allowed to properly escape.
Also, check out our web page, we may have a Certa Pro franchisee in your area.
Best of luck.
Ross Dessert
Certa ProPainters (KC)
http://www.gocerta.com
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In preparing our home for repainting, we have experienced a problem. When washing the house with TSP,bleach and water, this solution when applied to areas that were repainted a year ago with Benjamin Moore paint, causes the paint to bubble. This blistering occurs after rinsing the solution off. Once it dries, it appears to lay back down and it re-adhears. The surface underneath the Ben Moore was painted many years ago using Olympic Overcoat. The Olympic Overcoat does not bubble up or blister. When the cleaning solution drools across a piece of siding with it contacting both the old Olympic finish and the Ben. Moore finish, only the Ben Moore bubbles. Bleach and water alone does not cause blistering.
Is this normal? We are using real TSP by Savogran.
Does anyone know what is going on here and what should be done to prepare the surface for another coat of paint? What should we do about the areas that have re-adhered?