Caulking something to make it airtight and watertight is typically an easy process once you know whether you need to use polyurethane or silicone-based caulk to complete the job. Another thing that comes to my mind is some kind of silicone (like the one in hot-glue guns for example), but I have no idea if silicone reacts with PU. GE Silicone 2+ Window & Door. Temperature inside insulated bag inside insulated freezer. (This is just an idea so far, I'll report how it goes.) Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. Now PU cures by reacting with humidity in the air and till now, I could not find a way to store them for longer than 3-4 months without the content starting to harden and going to waste. Lifehacks Stack Exchange is a question and answer site for people looking to bypass life's everyday problems with simple tricks. Through-hardening of PU construction glue may then take very long then or not happen at all. I now use the remaining part of the freezer bag to place over the tube and reattached the nozzle to seal the tube. Asking for help, clarification, or responding to other answers. I've read in a forum somewhere, and I can confirm from own experience now, that PU construction glue (such as Sikaflex 252) has less issues with hardening in cartridges during storage, compared to PU sealant (such as Sikaflex 221). You might well find some small ridges left after you’ve run your finger down the silicone caulk. Why is the expense ratio of an index fund sometimes higher than its equivalent ETF? How can I maximize my refrigerator space when storing so many foods? The soap prevents the silicone sealant from sticking to your finger. stretch tape, cling tape, etc. But sometimes all of the sealant will become more viscous at the same time. Clean the end of the tube all around the outside, then wrap plastic food wrap around it tightly. it works for me with mapesil branded - every single time i used this on _any_cartridge it works. china. First, silicone caulk is inorganic, whereas polyurethane caulk is organic. Is there any way to fill in a hole in my shoe - so it is waterproof? Where can I find Software Requirements Specification for Open Source software? Personally I seal the thread of the nozzle with some PU construction glue before screwing it on, and place a tight-fitting nail or old drill into the open end of the nozzle that can be pulled out to re-open the cartridge. Another difference between the two sealants is that the sealing will last for over 20 years if done correctly when using silicone caulk. If the area is ventilated correctly, you should be fine, though. The recommended way to silicone is to “push” the bead of silicone ahead of the nozzle. I store all such compounds upside-down, so that any air which enters is at the bottom of the container and that which is near the nozzle is still liquid. In this condition I have been using the same tube for three weeks in pretty hot weather. Hunker may earn compensation through affiliate links in this story. Use PU construction glue instead of sealant for small jobs that won't finish a whole cartridge. Just because sealant feels dry to the touch (which it may after only half an hour), doesn’t mean it’s fully dry. Backed by a lifetime guarantee. It seems that everything that can transport even small amounts of humidity (and hardened PU sealant does) is sufficient to allow hardening over time. The most commonly bought are white or clear. This prevents air bubbles forming under the sealant. Of what I know wax is non-reactive with other chemicals and may work well in this case (but I am NOT a chemist, so check that first). Also uses up screws with stripped heads. 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