When spraying the car, you usually apply 3 - 4 coats.
First - Light Wet - When spraying the first coat, the paint, or primer has nothing or very little to stick/soak into, hence the "light" part. Usually it is sprayed so that it is almost "see through", this is done, so that the following coats have something to stick to. When spraying any layer, you should always try to achieve a "wet" look, hence the second part. "Light" "Wet".
Second - Medium Wet - when spraying the second coat, the paint or primer still does not have much to soak into (since the first coat was so light), but, because the paint does soak into the previous layer, it means, that you can lay it on a bit thicker without creating runs. That is why you spray on a medium saturation coat. The second coat is not meant to be heavy, but, it is meant to cover most, if not all, spots where you can see through the first layer of paint. As always, the finish should have a "wet" look. Hence "Medium Wet"
Third - Heavy Wet - Now that there is lots of paint for this layer to soak into, you can lay the paint on thicker (heavier) than the last two. The third coat is meant to be the finishing layer, and laying it on nice and heavy will achieve this. Again, it should appear "wet" when finished. Hence "Heavy Wet"
Fourth - Double Coat - A doule coat is usually used to give that extra "Umph" (if you wanna call it that), or for those who talk proper, more "gloss, or shine". This is done by (essentially) spraying the equivilent of two "medium" coats as one, which will give the finish a deeper, glossier look. Again, this should appear "WET" (Glossy) as it is the finishing layer. Hence "Double Coat"
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