I doubt it but I'm no expert.
too big--use a smaller size--6 inches is what I use--can be purchased at Home Depot
I don't understand the question, its not like you are asking about the sealer, its a tool that you use to spread it around.
My advice would be (a) check the website or (b) call your local home depot and ask a representative in the 'Pro' department.
Dump it on the street. The water will evaporate.
Put a screw in applicator to secure to handle.
Yes, the scraper part is a good 1/4" rubber. Seems pretty durable