Sanded plywood for exterior use

[Mossyoakglock]

I've got a piece of 3/8" plywood that I want to use for a project that I'm working on. I believe it's sanded but I know it's not pressure treated.

 

The plywood would be used outside. It won't have direct contact with water but it will still be exposed to moisture. Some water might make contact but it's not going to get soaked by direct rain, etc.

 

I also have a gallon of Speed-cote paint that I used when helping a neighbor paint their deck that I planned on using on the plywood. Do you guys think there is any problem with using non-pressure treated plywood on an outdoor project if I paint it before? I'm going to use the speed-cote as a primer and then paint the whole thing with Bear exterior paint to help in blend in a bit.

[TimmyG]

Sounds good to me

 

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[JrocK817]

I built a trailer about 7 years ago out of an old camper trailer.. Bought non-pressure treated and coated it with some thompsons waterseal i had in the garage. I still have the same plywood on it to this day. Driven through the winter with my old snowmobile and countless trips with the wheelers. Plus it sits outside all year..

 

You shouldn't have a problem at all.

[RyanbabZ71]

As long as you treat (coat) it prior to paint it should be fine

[Doug_Scott]

And make sure you seal the panel before assembly. Seal all sides and edges. This also assumes you are talking about real plywood, and not the beaver puke kind of particle board they call plywood.

[Ianf]

I use it outside all the time, I just treat it with BIN primer sealer AFTER cutting it on all side and where any nails or screws are going through before painting it. I tried Thompsons waterseal and found it wore off after a couple years on plywood and it would not hold paint for very long. Trick is to make sure there are NO missed areas that moisture can get into. The paint should be a high quality Enamel which is hard to find up here anymore due to VOC regulations.

[GasHog369]

Every brand has there own cheap products.. Speed-cote is a economy line of Glidden professional. I dont want to knock my own brand (I work for Glidden professional) but IMO dont waste your time. I know you said it is not going to see direct water contact, But the moisture in the air will easily get through that product especially if you are using it as a primer. Speed-cote is actually a top coat product (flat/sat/semi) It might say self priming for the flat, but it is not a quality primer.

IMO use an oil like coverstain, or a shellac based primer like BIN. If you want waterbase, Go with Glidden Gripper. Gripper is a excellent product that will bond to everything!

 

As for the topcoat, I'm guessing you allready have the BEHR from the rest of your house to blend it in? If not, I would recommend a different product if you have a Glidden Professional around you. Let me know if you have one an i can recommend the proper topcoat.

[Mossyoakglock]

I just realized that we have two gallons of Kilz. Half a can of Professional and half of a can of Latex. According to the website, the Kilz Professional is good for exterior applications. I might just use the Kilz as the primer instead of the speedcote.

 

I might use the Kilz and then the speed-cote as the top coat on the bottom and parts you don't see.

[Doug_Scott]

Get some exterior oil based stair/floor paint. I painted the stair on my deck and the floor in my shed with stair/floor paint, its been 8 years, still holding up. I do not recall the brand, but, it was a name brand paint, and was specific for stairs and floor. I added some silica sand to it when I painted the stairs as well to help traction in rain.