On Tue, 18 Jun 2013 21:21:16 -0400, Tekkie® wrote:

Here's a pic of the final result of the plumbing & electrical fixes:
http://www5.picturepush.com/photo/a/...g/13343543.jpg

Won't the sunlight attack the white PVC piping?

I googled that and found that you are wholly correct!

Mostly PVC impact strength is negatively affected by sunlight.
(And sunlight is one thing I get in spades where I live!)

I need to protect the PVC with a water-based acrylic/latex exterior black paint.

UniBell FAQ on Studies of PVC Pipe Performance Over Time:
http://www.plasticengineeredproducts...nibell/faq.htm

The Effects of Sunlight Exposure on PVC Pipe:
http://www.nacopvc.com/c/technical-i...re-on-pvc-pipe

Painting of PVC Piping for Ultraviolet Protection:
http://www.lascofittings.com/support...gPVCPiping.asp

How to Use Acrylic or Latex Paint on PVC:
http://homeguides.sfgate.com/use-acr...pvc-25511.html

Q: What effect does ultraviolet exposure have on PVC pipe?
A: In order to accurately quantify the effects of UV radiation on PVC pipe,
Uni-Bell members conducted a two-year study in the late 1970s at various
outdoor locations in the United States and Canada. In this study, PVC pipe
samples were placed on horizontal exposure racks and placed so that they
received continual exposure to the sun. At various points throughout the
study, tests to evaluate mechanical properties were performed on the
portion of the pipes that received the maximum UV exposure.

The results of the study (published as UNI-TR-5, "The Effects of Ultraviolet
Aging on PVC Pipe") indicate a gradual decline in the pipe's impact strength.
The lowest impact strength recorded after two years of exposure was 158 ft-lbf,
or 75% of the original ASTM value. Even this reduced value exceeds those of
most alternative sewer pipe products. These results indicate that no unusual
handling problems should be expected from PVC pipe even after long-term
exposure to sunlight.

The study results also show that Modulus of Elasticity and Tensile Strength
were virtually unaffected. The fact that these properties are unaffected
signifies that structural integrity and pressure capacity remain unchanged.
UV degradation does not continue after installation when exposure to UV
radiation is terminated.

The presence of an opaque surface between the sun and the pipe prevents
UV degradation, since UV radiation will not penetrate thin shields such as
paint coatings or wrappings. Burial provides complete protection.

When exposure in excess of two years of direct sunlight is unavoidable,
PVC pipe should be covered with an opaque material while permitting adequate
air circulation around the pipe. This prevents excessive heat accumulation.