[China Glass Net] When the film is dried and solidified, silky wrinkles are formed on the film surface. In general, wrinkles are divided into three types: one is the wrinkles produced by the previous film coating, the other is the wrinkles produced when the film is repeatedly applied; the third is due to the acid gas in the oven. The wrinkles produced by the action.
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Wrinkles in the front are easy to occur when using epoxy-based paints. Due to the catalytic action of acid gases in the oven, the surface layer of the coating film is solidified, causing internal strain and shrink wrinkles, also known as gas cracking or graining.
The second type of wrinkles tend to occur when using an alkyd paint or a conjugated double bond dry oily linker or a large amount of desiccant. When the surface of the coating film and the internal oxidative polymerization rate are inconsistent, the strain on the surface of the coating film and the inside are different, and wrinkles are formed.
The third type of wrinkle is liable to occur when the alkyd resin coating or the styrenated alkyd resin coating is repeatedly applied. This is because the cross-linked paint is repeatedly coated when the cross-linking density is not sufficiently achieved, so that the solvent in the coating is easily expanded and wrinkles are generated.
Film wrinkles:
In order to effectively prevent the formation of the front wrinkles, it is possible to avoid the spray film being too thick, and it should be noted that the components of the curing agent are reasonably determined so that the surface of the coating film and the interior are more evenly dried.
In order to prevent the formation of the second type of wrinkles, it is necessary to avoid the use of solvents with strong solubility in the top coat and try to use weak solvents with high volatility. When recoating, it is necessary to maintain a certain coating gap, and the surface layer can be sprayed after the underlayer is fully cured. 
