Rough time with Woodland Scenics " Smooth it"

[Biased turkey]

kinggargantuan, I didn't want to make fun out of you with my reply.
As a matter of fact Woodland Scenics recommends to tap on their "Paving Tape" after pouring the "Smooth-It" plaster.
Last Friday, at my LHS I checked the height of the paving tape and it looked like it is about 1/16 " but for casting my smooth-it road I used some N scale cork roadbed that is 1/8" high. That might be the problem
Maybe 1/8" is too deep and that's what might create the bubbles.
Thanks for your suggestion.

Jacques

[woodone]

When you mix your material, you can whip air into the mixture. They will rise to the surface once you pour the mix into your forms.
Just after you mix your materials, try tapping the bowel or what ever you are mixing the materials in. Tap it several times on a hard surface, you will see some air bubbles surface. Pop the air bubbles and tap again.Pop air bubbles. You will have to do this several times, and that should help.