Sealing Douglas Fir for outdoor use?

[Dozer]

I have a lead on some cheap douglas fir 2x6s that I was thinking of using to replace the deck on my trailer. My trailer sits outside all year. How long would it last if I where to seal it with something like Thompsons water seal? Any other reconmedations of what I should seal it with?

[sparcebag]

DougFir is pretty strong and will last longer than other species,But I'd for myself use treated the doug will not hold exterior finish very well on a deck outside exposed.

[fastkaw]

I think I would try turpentine and paraffin/wax.

Thats what I use on bird box's. Seems to hold up pretty good.

It's a little tricky to mix though. Make sure you do it out side. Hot turpentine

in the house can be problematic (grin)

[Surface Tension]

Seen a lot of old homes where they used fir beadboard on the porches with a slit slope. They all had roofs over them though.

I guess I's ask how cheap it is. Then consider that price compared to treated.

[Dozer]

I bought it for $0.24 a foot for 2x6s. They a dozen pallets of it and I got to pick an choose the best looking ones of the bunch. $47 for enough to put a deck on a 14' trailer so I didnt think that was so bad!