Bowfantatic:

Thanks much for some very important information. I assumed that the fiberboard compositions of today had to be advanced from yesterday's type. I had been researching types but without the knowledge you have about the material, I still would not have known which would (now) be best, other than to avoid the tar-based boards. Now I know.

I had read about the "virgin kraft," but compatability for a target was beyond my knowledge.

I am going to insert your information in the plans.