Building Tips and technical articles. > Paint and finishing

Base coat color

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James Mills:
I finally have my Formula S in primer (I'm going to sand a little more to try and get some more weight off).  The colors are going to be white, with red and blue trim.  I was thinking of painting the entire thing white and then the blue and red over the white as it won't take much blue or red to cover.  Would this build up more weight than shooting the color over the gray primer?  (Also, my lettering will be white and had planned to use a mask to block out that area when shooting the other color around it.

Thanks,

James

Allan Perret:
I have done exactly what you describe seveal times.
I dont think this method causes any significant weight penalty because the red and blue trim colors over the white will only take 2 thin coats for good coverage.  Only issue is when you sand down the masking edges of the trim colors before spraying clear you have to be real careful not to sand thru the trim.  To do this I use some kind of a shield and only expose about 1/8" of the trim, use 600 paper wet and very light pressure.  You dont have to take the edge all the way down, just knock off the bulk of it before shooting the clear..

Allan Perret:
I disagree with Ty.  It has been my experience that any trim color sprayed over a white base will result in a brighter and truer shade of the trim versus spraying same trim over a darker base.   

Tom Niebuhr:
I generally use a white base. Remember that reds and yellow are transparent and will show both variations in the base and the base color. . The solid white base works well for that reason. The white base works well for all colors. Lighter shade blues would also cry for the white base.

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