The covers should be secure and nearly waterproof (if not entirely waterproof). They should withstand self rescues and rescue attempts and should not budge when hit by waves or rapids. It is very dangerous for them to open or let lots of water in - try it some day during pool practice this winter (you do plan to check the pool days at CPAKayaker.com, right?) to see what happens to your stability and your ability to directionally control the boat with water in one or more hatches...
It is a serious safety issue for the covers to be good. Hopefully, the replacements will work, but with plastic boats sometimes the mould of the boat is bad and there isn't a choice of covers that would be tight without additional gizmos to keep them in place... A boat replacement should be done by the manufacturer (could go through the store if you like too) in such cases.
Full Size Sail Rig
1 Canoe/Kayak Trailer
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