Why Does Paint Wrinkle, Lift or Pull Away from the Surface?

Short answer

If paint starts to wrinkle, lift, crack or pull away from the surface, the most common cause is incompatibility between the materials used. The new layer does not react well with the coating underneath. It chemically attacks it, softens it or partially dissolves it. The result can be a scab-like, wrinkled or cracked surface that does not adhere properly.

The risk is especially high when the original coating is left in place, only sanded matte and then covered with a new material. Sanding improves mechanical adhesion, but it does not guarantee chemical compatibility between the layers.

Why does this happen?

Freshly applied paint or clear coat contains solvents. These solvents can attack the lower layer, especially if it is an old, unknown, sensitive or insufficiently cured coating. The lower layer may start to soften, lift or react with the new material.

The paint then does not behave normally on the surface. Instead of flowing out evenly and bonding, it starts to wrinkle, pull away, crack or form a rough scab-like texture. In this case, it is not just a visual defect, but a problem with adhesion and the stability of the whole paint system.

Most common cause: material incompatibility

This defect most often appears when different materials are combined or when painting over an existing coating. With an old coating, it is often not known which system was used, how old it is, how well it has cured or how it will react with new paint or clear coat.

The problem can occur even if the surface looks firm and stable at first. The new layer can reactivate, attack or soften the old coating with solvents. The lower layer then starts to lift and the new paint pulls away from it.

Risk when keeping the original coating

Keeping the original coating is always a compromise. If the old paint is only sanded matte and then covered with a new paint system, the work is easier, but an unknown layer remains inside the system.

The old coating may be original factory paint, an older repair, spray can paint, 1K material, old filler primer or a combination of several different layers. If its composition and history are unknown, there is always a risk of reaction with the new material.

Risk when combining different products

Another common reason is combining different products, manufacturers or chemical systems. Not every primer, filler, base coat, effect coat or clear coat is automatically compatible with every other product.

The risk increases especially when unknown spray paints, old 1K materials, cheap universal paints, old repairs and new paint systems are combined. If the layer order is unsuitable or the products are not compatible, the paint can lift, wrinkle or peel away.

Other possible causes

• the original coating is not chemically compatible with the new layer,
• the old paint was only sanded matte, but was not stable,
• the lower layer was not sufficiently cured or flashed off,
• the new layer was applied too heavily,
• the new material contained too many solvents for a sensitive surface,
• different systems were combined without a prior test,
• the surface was contaminated, greasy or poorly prepared,
• the part had residues of old spray paints, waxes, polishes or unsuitable cleaners.

What does the defect look like?

The surface typically shows a wrinkled, cracked, scab-like or rough texture. The paint may look as if it is tearing away from the lower layer or being rejected by it. The surface does not hold firmly and can often be damaged, peeled or disturbed easily.

The defect can appear immediately after applying the new layer, but sometimes it appears only after a short time, when solvents begin to react with the coating underneath.

Why does another coat not help?

If the paint is lifting or wrinkling, the problem is not that there is too little material on the surface. The problem is that the layers do not react correctly with each other or that the lower layer is not stable.

Another coat usually does not solve the defect. On the contrary, it can add even more solvent load to the lower coating and make the reaction worse. The surface may continue to soften, crack, lift or lose adhesion.

How to prevent the problem

• if the original paint system is unknown, always expect some risk of reaction,
• before a larger job, make a test on a small less visible area,
• do not unnecessarily combine unknown products and different systems,
• use compatible products in the recommended layer order,
• if in doubt, remove the old coating down to a firm stable base,
• follow the recommended flash-off and curing times,
• do not apply layers too heavily, as they can attack the lower coating more strongly,
• clean, sand matte and degrease the surface correctly before painting.

What to do if the paint starts to wrinkle or lift

If the reaction appears, it is best to stop the application and let the surface cure. As long as the material is soft, sticky or actively reacting, it should not be sanded or covered with another coat.

After curing, the damaged layer usually has to be removed or sanded back to a firm stable base. Only then should the surface be cleaned again, degreased and continued with a suitable paint system.

When is it better to remove the old coating?

It is better to remove the old coating when you do not know which material was used, when the surface has reacted before, when the paint is peeling, soft, cracked, poorly adhered or when it is an old unknown repair.

Removing the old coating takes more work, but it is often safer than painting over an unknown surface. A stable and compatible base is the foundation of a good result.

Summary

• Wrinkling, lifting or paint pulling away is most often caused by incompatibility between the materials used.
• The risk is high when painting over an original or old coating that has only been sanded matte.
• Sanding old paint matte does not guarantee chemical compatibility with the new layer.
• New paint or clear coat can soften, attack or dissolve the lower coating.
• The result is a wrinkled, scab-like or cracked surface that does not adhere.
• Another coat usually does not solve the problem and can make the reaction worse.
• The damaged layer usually has to be removed down to a firm stable base and the application repeated with a correct system.