What happens if you put more weight in a kayak than the allowed weight limit?

We just bought a kayak which has a posted weight limit of 250lbs. This is not a problem for me, but my husband is a big guy and weighs about 290 lbs. Would the kayak sink if he tried to take it out on the water? He is able to sit in it, since the opening is pretty wide. What kind of wiggle room is there in terms of... show more We just bought a kayak which has a posted weight limit of 250lbs. This is not a problem for me, but my husband is a big guy and weighs about 290 lbs. Would the kayak sink if he tried to take it out on the water? He is able to sit in it, since the opening is pretty wide. What kind of wiggle room is there in terms of the weight limit on a kayak? Thanks.
Update: The kayak is a closed sit-in (not sit-on-top) kayak.
Update 2: It's for flat water.
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