You could also try shellac as a primer.
Tanus wrote:
We found a dollhouse that had been tossed out in the trash and decided
to fix it. Mostly it was gluing up bad joints and repairing some small
wood pieces that had broken off from abuse.

The floor is hardboard which is holding up pretty well, but the walls
are all 3/8" particle board. They had been covered with wallpaper, which
SWMBO wanted removed and the board cleaned for painting. I"ve done most
of that, but I have a concern about painting the boards. I have a
feeling that it'll suck up as much paint as we can throw at it and still
look pretty splotchy.

Has anyone ever successfully painted particle board? I was thinking of
adding some sizing to it to fill it up, and had considered using a
yellow glue/water mix. Does that make any sense? Or should I just slap
paint at it til it looks ok?

TIA

Tanus
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This is not really a sig.