mold questions

[mpg]

Hi,

I have a bunch of questions about using fiber paper and fiber board as molds.

I have some Kaiser-Lee fiber board that I want to use for frit castings and drop-ring slumps. I've read that "primo primer" is best to use to prep these as it will turn to dust at fusing temps. Can I use other kiln washes or will I run into trouble whe I try and remove the wash from the mold to prep it for a secong casting or slumping?

What's the advantage of using hardener with fiber paper drape molds? Does it allow you to get more than one use from a mold?

Thanks!
Michelle