On Thu, 13 Apr 2006 22:19:22 -0500, Al Bundy
wrote:

If done via painting, endpriming and back priming are a must like you
said. Painting with oil based is another. In cases where the endcuts are
very likely to get repeated water exposure, I've even coated the ends
with silicone. Not sure how effective it was but I don't think it hurt.

Good idea, and reminds me that I forgot to mention caulk. With
"horizontal rain", as the OP talked about, I would be carefull to
caulk all the joints. Leave the bottom open, so water has an exit.

T.