Look up inland marine.
https://mobile.inlandmarine.us
They have a sealant that we use for the US Military in their Zodiacs. It’s far better than Bixlers toob seal. We’ve tried that and it’s not a recommended product.
Inland marines sealant took a zodiac FC470 with almost every seam leaking and more pinholes than I could count…. And fixed damn near everything. These boats would barely hold air for 15 minutes. After the treatment, they not only passed a 24 hour test, but they held air with no loss for over a week. When cured, the sealant was not tacky and the boats didn’t not get all stuck up inside when they were rolled up.
I highly recommend this for your repair and toolkit.