Yes I've to had bad luck once with the dave brown sorgum stuff. Thats why I only used it once. I have been using the 3M super 77 spray adhesive with ecxellent results. Used it on the past 3 planes. One of them is now 14 years old with 200 + flights on it and not a problem. The key is to smoth sand the cores with fine paper and vacume up the dust. AND FOLLOW THE CAN (3M 77) TO A TEE)

Gunny