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2BLOK™ makes a 100% air tight seal on caulking tubes and foam can applicator straws. I don't know of ANY other product that can stop a can of Great Stuff™  from hardening in the straw, but mine does! This product is totally unique and comes in packs of 2 which can be used multiple times. I have tubes that are over 2 years old in my basement that are still as fresh as the day I opened them.There is no clean up at all as with the other products that are on the market.

JUST REMEMBER THIS!
• NO PRODUCT CAN CLAIM TO STOP CANNED FOAM FROM CURING!
• NO PRODUCT CAN CLAIM TO KEEP A CAULKING TUBE FRESH FOR 2 YEARS . . . . . 2BLOK™ CAN!

How to keep 3M 5200 fresh for weeks

 



The Power of 2BLOK™

 

 
A soft polymer ball when applied to the tip of a caulking tube or applicator straw as directed will stop all air infiltration, thus stopping the curing process. No clean up. Can be re used many times. Saves time, money and wasted trips to the hardware store. Patent pending