I have found that both permadent and ordinary foundation is badly drawn if interspersed with already drawn ( but uncapped ) combs. The bees apparently prefer to work on the already drawn comb rather than the new foundation. They seem to draw nice combs if you intersperse the foundation with capped combs. The new combs are drawn to within a beespace of the already capped combs surface; if the previously drawn combs are straight then the new ones will be straight. Any warpage or low spots will be reproduced in reverse on the new combs. DONALD AITKEN email: [log in to unmask] 11710-129 St. EDMONTON, AB, CANADA T5M 0Y7 (403) 451-3455