paint grade exterior plywood

[kicknargel]

I'm building a mobile marketing cart for a university. They'll be pushing it to various locations around the campus, so it needs to be able to withstand getting wet, and it also needs a very smooth paint surface. I'm trying to decide between using birch veneer ply (my lauan non-rainforest alternative) and really thorough urethane coats, or ACX and somehow sanding and filling all the grain. Or a magical third option. Thoughts? Do you think the "lauan" can be made to survive? Any good techniques on killing the grain of ACX?

 

[derekleffew]

Sounds like a job for MDO. Is the plywood structural? Orange store seems to carry it only in 3/8".

 

[kicknargel]

That does look like just the thing. Orange Store doesn't seem to have it in CO (maybe that's why I'm not very familiar) but I bet I can find it. Thanks.

 

[Van]

Rats ! Derek beat me to it again. Exterior grade MDO, or "sign board" is the way to go.