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Color Coat Sanding


angussg

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It's kind of hard to judge without seeing it. White streaks that are visible while sanding might indicate places where a heavier grit has gone deeper than other places and you need to wet sand more with a higher grit to work it out. This could be from several things - uneven spray (no matter how hard you try - it happens to all of us), uneven sanding (not using a block), when you're done dry sanding, the whole piece will look rather white. Once you start wet sanding, this will clear up a bit as you work up to 2000. Usually by 2000, some of the gloss has started to come back and you see where there are larger scratches left by larger grits underneath. If you start hitting the color coats, it's time to stop, wipe down with mineral spirits and spray more clear.

The wet sanding is quite important as dry sanding is really meant to just get rid of the "shiny spots" thus making the finish level. From there, you're just trying to get rid of the scratches made by the dry sanding by obscuring them with higher and higher wet sanding grits. Got any pics?

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