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"seam sealer" is a non specific term - there's McNett Seam Grip for polyurethane coatings, various silicone sealers for silnylon,...
McNett Seam Grip and Shoo Goo are both polyurethane. I think they're pretty interchangeable. Maybe Shoo Goo is thicker? It's intended application is like fixing the sole of a shoe. McNett Seam Grip intended application is sealing seams and patching holes.
McNett and Shoo Goo have a short shelf life, especially after you open them. I had some Shoo Goo that was partially dried out so I added some Toluene or whatever the solvent is. It identifies it on the outside of the package. That stuff is very unhealthful, so maybe you should let it dry outside or in garage.
Another thing about the polyurethanes is they don't dry good. Even after days, if you have two surfaces that were coated, and they touch each other, they will stick and you can't get them apart. It will peel the polyurethane off one of the two surfaces. You have to rub some powder on the surfaces to make them non tacky. Like talc, or dried clay from soil, or scrape wall board compound,...
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