Paint Blistering - Causes & Solutions

If you love to paint, then you obviously hate to see dome shaped paint bubbles or paint blistering ruin all of your hard work. Those dome shaped bubbles mean that the paint is losing its adhesion; it can happen indoors or outdoors to any kind of paint, especially latex and acrylic. Do not despair; there is a way to prepare for it and prevent it.

Causes and Effects

Though blisters and bubbles seem similar, their causes are actually different. Blistering is what occurs when the upper layer separates from the lower layers. There is no way to predict its occurrence. On the other hand, bubbles are caused by a chemical reaction that is triggered by paint on a hot surface. The top layer of paint forms a barrier that prevents solvents from escaping. The heat of the surface vaporizes the solvents and the expanding gases force the paint into a bubble.

Preventative Measures

The best way to prevent paint blistering is not to paint a dirty surface or use a finish that is incompatible with the surface; for example, never paint a latex base with an oil-based paint. Paint shrinks when it dries, and it will pull up sections that have not fully adhered. Make sure you always paint on a clean surface. To avoid bubbles, never paint in temperatures above 85 degrees Fahrenheit or in direct sunlight. If you must paint under these conditions, use a paint conditioner. Always choose the right type of conditioner for water or oil-based paint, and do not thin the paint with paint thinner or water.

The best way to treat paint blistering or bubbling is to take preventative measures ahead of time. Always try to avoid painting dirty surfaces or using incompatible paints, and avoid painting in the heat. With these easy steps you can stop it before it starts.

Primers and Finishes

Priming is essential for better adhesion, sheen uniformity, mildew control and durability.
Select a top quality exterior paint in the color and sheen of your choice.

Substrates, Primers

Substrate: Bare Wood
Primer: 255 Stain Lock II Acrylic Primer
Finish Coats: 1240 Acry-Shield Exterior Flat Finish
1245 Acry-Velvet Ext. Low Sheen Finish
1250 Acry-Lustre Ext. Semi-Gloss Finish
1235 Seasons Ext. 100% Acrylic Flat
1236 Seasons Ext. 100% Acrylic Low Sheen

Substrate: Masonry
Primer: 247 Chem-Guard Acrylic Primer
Finish Coats: 1240 Acry-Shield Exterior Flat Finish
1245 Acry-Velvet Ext. Low Sheen Finish
1250 Acry-Lustre Ext. Semi-Gloss Finish
1235 Seasons Ext. 100% Acrylic Flat
1236 Seasons Ext. 100% Acrylic Low Sheen

Substrate: Metal
Primer: 1725 Kel-Guard Acrylic Metal Primer
Finish Coats: 1240 Acry-Shield Exterior Flat Finish
1245 Acry-Velvet Ext. Low Sheen Finish
1250 Acry-Lustre Ext. Semi-Gloss Finish
1235 Seasons Ext. 100% Acrylic Flat
1236 Seasons Ext. 100% Acrylic Low Sheen

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