Edge mapping

Raised or lifted edges in the wet or dry paint film that outline sand through or feather edges.

Cause:

Solvent from the new topcoat penetrates a solvent sensitive substrate causing a lifting or wrinkling that outlines the feather edge.

Repair:

1. Sand smooth or remove the affected area. Final sand with 400 or finer grit sandpaper.
2. Isolate affected area with two component primer surfacer and refinish.
3. Or, apply acrylic lacquer primer surfacer thinned with non-penetrating thinner, sand smooth and refinish.

Prevention:
Check questionable finishes by rubbing a small inconspicuous area with a shop towel saturated with lacquer thinner. Finishes susceptible to lifting will soften, wrinkle or shrivel as lacquer thinner is applied. If any of these reactions occur, the following recommendations should be considered.

1. Use acrylic urethane primer surfacer or an acrylic lacquer primer surfacer thinned with non-penetrating thinner over sensitive substrates.
2. Use 400 or finer grit sandpaper when feather edging.
3. Avoid sanding through insoluble topcoat colour or clear, exposing solvent sensitive or soluble finishes.