Thanks everyone,

I will try Artistico #300 and 2 ply matboard for now. We will see how they work out. 2-ply board is about the right weight for me. I know where I can get non-buffered 2ply matboard. Or I will give OA bath to 2 ply board that I have...

Warmly,
Tsuyoshi

p.s. Michael, what is PVA?