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Old March 12th 06, 03:31 AM posted to rec.aviation.homebuilt
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Default Painting with Latex House Paint


Rich S. wrote:
...
The UV protection comes not from silver but from a coat of black latex under
the color coat. ...



This is an oft repeated canard. For some strange reason, folks simply
assume that since black paint blocks visible light, it must also block
UV light. By that logic, it would be legitimate to assume that black
paoint blocks every other wavelength in the spectrum: xrays, infrared,
radio waves, gamma rays, etc.

Ok, so if we quit making groundless assumptions, what've we got? Mmmm,
how about scientific analysis?

A Pietenpol builder by the name of Kirk Huizenga did a series of
spectrometry tests on several colors of latex. Turns out that there's
nothing special about black, nothing at all. Paint it with whatever
color you want, they all protect from UV equally well. His report, the
transformed data and the analysis are available (pdf & xls files):

http://www.mykitplane.com/Planes/fil....cfm?AlbumID=5

Daniel