Reference: Shrinkage

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SHRINKAGE

(Bullseyes, Ringing, Edge Mapping)

The repaired area, featheredge, or sandscratches become visible within hours, days or weeks after the repair is completed.

Topcoating before undercoats have thoroughly dried/cured.
Undercoats applied excessively wet with inadequate flash time between coats.
Undercoats under reduced.
Using a poor grade and/or too fast evaporating thinner/reducer for spray conditions.
Finishing over body filler that has not thoroughly cured.
Using too strong solvent cleaner or using thinner/reducer as a surface cleaner.

Allow the affected area to thoroughly dry/cure, sand and refinish.
If additional filling is necessary, apply a primer surfacer, sand smooth and refinish.

Allow undercoats to thoroughly dry/cure before sanding and/or topcoating.
Thin or reduce undercoats according to product label directions. Apply in thin wet coats allowing adequate flash time between coats to avoid "bridging" scratches.
Select recommended thinner/reducer based on temperature, humidity, air movement, and size of repair.
Follow body filler manufacturer's recommended cure time.
Use solvent cleaner designated for either lacquer soluble or cured enamel/urethane insoluble substrate.


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