DAP claims its Draftstop 812 polyurethane foam sealant can be reused for up to 30 days after opening and that the foam won’t harden in the straw during that time. We can’t guarantee that, but we did have good results after a week. The key is to reinsert the little “safety tab” in the straw’s tip when not using the can. Make sure to squeeze the trigger and not pull up on it, unless you want a foamy mess. It comes in 16-ounce cans for $16. DAP Products, 410.675.2100, dapspecline.com

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