What is the best way to seal exterior wood

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Forum topic by RockyTopScott posted 09-03-2009 11:31 PM 2565 views 0 times favorited 3 replies Add to Favorites Watch
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1186 posts in 3506 days

09-03-2009 11:31 PM

For something like a mailbox post.

I have some left over lumber and don’t want to use pressure treated.

Should I just prime and paint it?

Thanks in advance Scott – Chattanooga, Tn

-- “When you want to help people, you tell them the truth. When you want to help yourself, you tell them what they want to hear.” ― Thomas Sowell

3 replies so far

View TopamaxSurvivor's profile


18291 posts in 3704 days

#1 posted 09-04-2009 05:51 AM

If you put it in the ground, it will rot unless you use something like penta.

-- Bob in WW ~ "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View stefang's profile


15881 posts in 3362 days

#2 posted 09-05-2009 01:46 AM

I read a recent article in Fine Woodworking magazine where they tested all the reputed best outdoor finishes. The marine varnishes were the hands down winner. One of the great advantages to this type of finish is that it doesn’t harden to the point of brittleness and it has a ultraviolet light screen to protect against the sun which is the most destructive element to outdoor finishes.

-- Mike, an American living in Norway.

View LesB's profile


1748 posts in 3471 days

#3 posted 09-05-2009 02:01 AM

Here is another alternative.
Use cement and two pieces of galvanized steel angle iron about 1/4” thick by 1 1/2” on a side and 3 to 4 feet long. You can use 1 1/2 inch galvanized pipe, or flat steel if it is more available. Cement the steel in the ground with about a 12 to 18” sticking out and spaced apart the width of the wood post; on the opposite corners for angle iron. When the cement is set up you can bolt the post to the steel with a air space under it so it does not touch the cement; or place a piece of asphalt roofing material between the bottom of the post and the cement. Cement conducts moisture and you don’t want the wood to contact it. Now the wood will not rot because it is not in the soil and you can prime and paint it to or not. Should the post eventually deteriorate you can easily replace it without any more digging or cementing. I like this technique for fence posts too.

-- Les B, Oregon

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