Expanding sealant tape

The preformed expanding tape seal is ideal for indoor and outdoor applications. Because of its gradual expansion, it perfectly fills in joints and gaps to prevent water, air, snow and dust infiltrations. Its self-adhesive backing can be fix to all surfaces including metal, wood and glass. This foam tape measures 1.5cm (5/8in) wide by 6m (19ft) long. Its thickness varies from 0.8cm (5/16in) when compressed up to 1.9cm (3/4in) once it reaches its full expansion. Grey.

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Expanding sealant tape is rated 2.0 out of 5 by 1.
Rated 2 out of 5 by from Does not expand as advertised This seemed like a good product to put on replacement windows just before installing instead of spray foam but it only expanded from 1/4 to 3/8-1/2 inch at most. I put a small piece in front of my heat register for a week and it is 5/8" at best. Not sure why it will not expand as the picture shows. Maybe it is old or needs some kind of accelerator. I will use the rest of it and if there is no further expansion then I will have to find some other use and go back to spray foam. Awfully expensive for a useless product.
Date published: 2019-04-27
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