Had to do some sealing today and I came across this info which worked well to remove the butyl and thought I'd share it with u all cost is just pennies and couldn't believe how good it worked, first s...
If butyl doesn't stick to cooking oil, I think a little more rigorous cleaning of the oil would be recommended before putting back together with fresh butyl. Also, unless you can hit framing, longer screws won't be of much help. You might be better off with a butterfly or molly?