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interior in my z31 using the 77 grade and it has held up perfectly, including the T-bar roof to 100 mph wind :c) 

Why not just use 90 and be done with it? Unless you're an upholstery expert, you will be doing some pulling and repositioning of your fabric. The bonding time for the 77 was up to thirty minutes. I can't recall what the drying time for the 90 was, but it's a lot quicker. Plus, the 90 is so strong you may stretch or deform your fabric when you pull it with the 90. So I liked the workability of the 77, and have no regrets. I think I did my interior over three years ago. Peeps here will tell you to use the 90. 3M also makes an 80 that may represent a good compromise. One tip: If you use the 77, spray the interior surface AND the back of the fabric before applying. Good luck.
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