Seal or Prime Bare Exterior Wood?

snikcillaJune 29, 2009

I have a small exterior porch of regular bare wood (not pressure treated). The tops and sides of the boards have been primed and painted with latex paint.

The bottom of the boards are still bare and I want to "treat" them. Should I seal them? Or prime them? Or something else?

(Last time they were primed and painted, the rain leaked(?) through and caused the latex paint to develop hanging bubbles of water (hanging down from porch planks.) So I am hesitant to put latex primer and paint on the underside of new bare wood again.

What would you suggest?

Thank you.

Thank you for reporting this comment. Undo
brickeyee

"(Last time they were primed and painted, the rain leaked(?) through and caused the latex paint to develop hanging bubbles of water (hanging down from porch planks.) So I am hesitant to put latex primer and paint on the underside of new bare wood again."

What are "hanging bubbles of water?"

Do you mean the water leaked through and dripped off the bottom?
That would be expected.

    Bookmark   July 2, 2009 at 9:06AM
Thank you for reporting this comment. Undo
snikcilla

Well the rain got underneath / inside of the multiple coats of latex paint (rolled to the underside of the board) and caused the paint to stretch out and form a pocket full of water!

The latex paint streched out like a balloon and collected the water, so I had paint pockets filled with water hanging off the underside of my porch. (Which is the second floor entrance porch, so you could walk underneath and see what was happening.)

Any thoughts on eliminating this with a different kind of coating / sealer would be appreciated. Thanks.

    Bookmark   July 2, 2009 at 10:07AM
Thank you for reporting this comment. Undo
brickeyee

How wet was the wood before painting?
If it was pressure treated it needs to dry out before painting since it gets saturated with water during treatment. That is why pressure treated wood is so heavy when purchased.

If the paint job was thorough, the next place to look is end grain.
It will soak up water and wick it into the wood a pretty decent distance.

For exterior wood that will be painted you can saturate the end grain with Minwax wood hardener till a gloss barely develops, then prime and paint.
It works very well on thinner sections that can rot and warp more.

I replaced 5 year old 1x6 corner boards on a house that had rotted at the butt joints between boards (3 stories on the back of the house).
After 15 years the replaced wood is still doing fine.

    Bookmark   July 6, 2009 at 9:18PM
Sign Up to comment
More Discussions
Maple floor, pine trim oak cabinets
Help please! We just sanded our maple floors and are...
JenG92
Removing excess dried tung oil, over wax...
Hello, I was refreshing the tung oil finish on my walnut...
pasigal
Can this door be repaired?
We're renovating a 1920 house and this bedroom door...
weedyacres
Brand new dewalt planer, not feeding?
Hopefully it's just me doing something wrong. It's...
fireweed22
Installing new deck door
I've ordered and received a new custom pre-hung deck...
africanboy
© 2015 Houzz Inc. Houzz® The new way to design your home™