They will adjust, but why mislead them to start with? Wood strips are more durable and you won't have to do them more than once. If you really want wax (I don't) you can make wax sheets very easily. Soak a board in brine and dip in wax. Peel off the sheets (you'll get two sheets, one from each side, and two strips, one from each edge). The sheets can be cut with a pizza cutter or one of those rotary cloth cutters used by quilters...