The tube has an expiration date and I suspect an expired product could be the cause of some of the bad reviews I've read. However, I used it before the expiry date and it was still extremely difficult to squeeze out with a manual caulking gun and then quite messy to work with. I have installed a Thule bike carrier stating that this or several other products only available in Europe have been used. Can't comment on strength or durability as it hasn't been around long enough. crossed fingers