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Problem Solving Forum (6)

Does the presence of non-burst blisters in a coating system always mean that the coating requires replacement?

I have several 20-year-old carbon steel tanks for storing demineralized water. The original coating (type unknown) has started to blister. What material, at what DFT, should be used to refurbish the coating?

During a week of heavy rain, we painted the interior of a heated concrete building. The paint blistered badly a week later on the walls with an outside exposure. What’s the best way to remove the coating, prepare the surface, and recoat to prevent future blistering?

During a week of heavy rain, we painted the interior walls of a heated concrete building. On the interior of walls that had an outside exposure, the paint blistered badly a week after the rain subsided. Could the rain have caused the blistering and, if so, how?

What causes blistering/crater formation in freshly applied polyurethane topcoats, and how can this be avoided?

Under what conditions should small-diameter blisters (<1.5 inches) in a water tank lining be repaired/repainted? Should the blisters be broken and the substrate examined?


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Dampney Co., Inc.
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DeFelsko Corporation
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Montipower, Inc.
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IBIX North America
Portable Powder Coating System

All-in-one skid mounted system for on-site repairs. Durable coating for industrial, structural steel, pipeline and marine applications. 727-322-4611

Armakleen Company, The
ARMEX when nondestructive cleaning is critical

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Oxford Instruments Coating Measurement

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