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How to deal with the cracks and brittleness of plastic hardware

2021-07-19 10:30:21
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How to deal with the cracks and brittleness of plastic hardware

- linear crack

The surface of the paint film has obvious linear crack penetration, and the cracks are more parallel. Black or other dark paint surfaces are more common.

reason:

①The sandpaper used for surface treatment is too thick. The correct way is to use the sandpaper for each polishing to be finer than the previous one.

②Improper use of the thinner and excessive dissolving power, the thinner suitable for paint should be selected.

③If the original paint surface or repaired surface is not properly treated, the original cracks have unremoved traces. This phenomenon often occurs when a new paint layer is sprayed on the original cracked paint layer. Therefore, when the paint surface is repaired The repaired area should be fully cleaned.

Approach:

For the surface and substrate of the old paint, the correct primer and topcoat should be selected. If there are cracks, the surface should be smoothed with fine sandpaper to expose the inner layer, and then spray again with a suitable thinner.

-Brittle

Also known as claw marks, the cracks are irregularly linear and expand outward.

reason:

①The spray paint is too thick during the painting process, causing the total thickness of the old paint and the new paint layer to be too large and cracks. Therefore, it is necessary to strictly abide by the operation specification of multiple spraying with thinner paint to achieve the correct coating thickness.

②The paint layer is too thin, especially if the paint layer is too thin, it will cause the paint layer to crack or fall off prematurely.

③The quality of the paint is too poor, or the paint surface is exposed to the sun for a long time, or the paint surface is corroded by the chemical substances in the atmosphere. These conditions will cause cracks.

④The old paint layer or the influence left after repairing. It should be ensured that the primer matches the primer, and the old primer of the primer should not be too thick.

⑤Ensure that the new spray paint is combined with the old paint layer. Because factors such as climate and paint thickness will affect the drying time of the paint layer, it is not only necessary to construct according to the drying time, but should be handled flexibly.

⑥ Paint that has not been fully stirred evenly, or has not been sprayed with partially gelled paint. The mixing is not uniform, the additive components in the paint cannot fully function, the stress resistance of the paint surface is reduced, and cracks are prone to occur.

⑦Spray coatings on the supercooled surface, such as a single-component acrylic varnish surface.

Approach:

Fully polish the cracks until the primer, and then re-spray. In severe cases, the paint layer should be removed until the metal layer is exposed and sprayed again.


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