Paint Peeling on Metal or Masonry - Causes & Solutions

Many homeowners choose to paint their own homes in order to save money and for the satisfaction of completing their own home improvement projects. These projects often lead to wonderful results, but occasionally coats of paint lose their adhesion and peel, particularly when painted on metal or masonry.

The causes of metal paint peeling

Several factors can contribute to paint peeling on metal and masonry, but the most common cause is failure to adequately prepare the painting surface. Any paint job requires some surface prep, but with metal and masonry it is especially important. Metal surfaces are frequently covered with rust that could lead to future peeling.

The cause of masonry paint peeling

Masonry does not face issues with rust, of course, but its porous nature makes it difficult for paint to adhere firmly. Another issue with masonry arises from efflorescence, which is a crystal deposit that comes from alkaline salts within the masonry. Without proper removal, the paint on your masonry will eventually peel off.

Solutions to metal paint peeling

To keep paint from peeling off of metal, you must properly clean the surface and use a high-quality primer. You should remove any loose rust and paint with a heavy-duty wire brush. Then, the surface needs further cleaning through the application of mineral spirits with a lint-free rag. After the surface is thoroughly cleaned, a primer and two coats of paint provide a long-lasting finish that resists peeling.

Solutions to masonry paint peeling

Masonry requires a similar approach and also begins with thorough cleaning. Once again, a wire brush should remove most surface dirt and efflorescence, but a power washer is necessary to ensure that any remaining residue is removed. Masonry also requires a sealer and two coats of primer to ensure proper adhesion. After these steps are completed, paint should resist future peeling.

Household repairs are inevitable, but peeling paint remains almost entirely preventable. Proper preparation is the key. By cleaning the surface thoroughly and using a high-quality sealer, metal and masonry surfaces provide a perfect surface on which to paint.

Primers and Finishes

Spot prime all bare areas 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: Masonry
Primer: 239 Kel-Bond II Surface Conditioner
Finish Coats: 1240 Acry-Shield Exterior Flat Finish
1245 Acry-Velvet Ext. Low Sheen 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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