Hi guys.. I have rolls of it, but haven`t used it yet so can`t give a definitive answer, but if it`s a really strong tape, I can see no reason not to swim. You`d be really surprised at how strong glues and [strong] tapes are. Obviously prolonged exposure to salt water etc will have an effect, but certainly you`re in no danger of literally just hopping into the water and your system de-bonding......just won`t happen. As for sand sticking to glue..the glue doesn`t remain wet/tacky...... it sets. It`s usually advised to allow 24 hours after a bond is done, before engaging in highly active things like gym etc....... otherwise the `life`of the bond may be compromised. Even when I used the Salon, I was always told to wait 24 hours for the glue to fully cure before exercising etc. Paul.