Here you can find helpful information if there is already a defect in the paint

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Solvent boils/popping

Blister-like surface defects due to solvents trapped in the paint film.
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Solvent test

Information and tips for performing the solvent resistance test
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SPOTTING CAUSED BY EXTERNAL INFLUENCES

Physical attack or discoloration of the paint surface due to various causes; the spots take various shapes, colors and sizes.
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Stone chipping

Mechanical damage to the coating due to projected small stones / chippings (e.g., loose gravel).
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Temperature table

The temperature makes the difference WHICH HARDENERS AND WHICH REDUCERS SHOULD BE USED IN 2K PU TOPCOATS AND CLEARCOATS? The temperature table provides a clear and straightforward overview about what product is suited for use at a particular temperature.
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Water spotting

Mostly light, whitish circular spots / lifting of the paint surface caused by water drying on the surface in combination with lime and salt. The inner areas are normally intact, while the outer edges are slightly lifted.
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Wrinkling

Rippled paintwork surface with uneven grooves. The upper coat dries faster than the coat under it. Occurs only with synthetic resin paints.