DIYbanter - Waterproofing Oil-Painted Trellis

"Mike Brophy" wrote in message
oups.com...
I'm having a cedar trellis built over my patio and am having it painted
with a white, oil-based paint (to match the rest of the trim of the
house).I plan on having wisteria or other vine grow up over the
trellis, but my contractor told me that only a stain is recommended if
foliage will be on the trellis, because the white paint will turn
green, get mossy, etc. I live in Seattle so there are 9 months of very
damp weather.

My question is this -- is there a way to paint the trellis white to
match the rest of the house, but also water seal over the paint?

Thanks.

Mike

Mildew can feed on the organic compounds used in oil-based products. I'd be
surprised if the average general contractor knew this, though. This is not
to say that you shouldn't use oil-based products outdoors, obviously.
Exterior paint is designed to deal with being rained on. There is no reason
you shouldn't prime the trellis with an oil base primer (make sure you
choose one that is spec'd for exterior use - original KILZ is not, for
example), and finish with a solid color stain - acrylic latex or otherwise.
I'd recommend using the latex solid color stain. I'm especially fond of
Cabot's products like their PRO-VT. If you want to use stain but also want
a bit of sheen, you can use decking stain. Otherwise, just use exterior
paint. There are plenty of exterior latex paints that would work just fine.