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I think wet sanding also helps it to cure faster. You break the surface and allow the solvents another chance to dry. Like if you had a big bowl of pudding in the refrigerator and it forms that skin that you have to remove to get to the wet stuff.



The other point to doing the wet sanding between alternative coats of paint is that it allows you the chance to bring the entire surface LEVEL.

If you don't wetsand, any imperfections will just get amplified with each coat of paint you add. So by knocking all the surface back down to one level it gives each subsequent coat of paint 'as level a surface as you can provide it' so that when it 'self levels' while drying you will get as close to a smooth surface as you can get.

Ultimately the bottom line is that the smoother the subsurfaces and final coating, the 'shinier' and 'glossier' the end product will be.


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