What color is this when cured?

This is white. Hope that helps and thanks for your interest in our marine sealant.

can I use this to repair a crack in my hot tub? Is it safe for continual underwater use?

Yes it is safe for continued underwater use but you will want to make sure it completely cures and dries prior to submerging it. Hope that helps and thanks for your interest in Better Boat

How many Ounces is in a container

Don’t have it in front of me, but it is the size of a normal tube of caulk and will fit into a standard caulk gun.

Will this work around my stainless steel fuel tank filler neck

Yes our marine sealant will absolutely seal and adhere to your stainless steel neck. Thanks so much for your interest in our marine sealant.

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