i know what you are saying but have had much better success with welding, done over 20, and the last couple were welded much better finished project and never a problem, but those damn boots were a PIA, when they left the shop there great, dont know what the customer does to them they come back falling off torn, or leaking, I think they think (customer) there trucks are submarines. I would use the best silicone, inside the groove and on both sides of the out side, maybe the bass shakes them loose, IDK, they all were pretty big systems, 4 -15's, 6 15's, 8 15's, 4,6,8,12,16 12's , these were not getto systems!