Seriously far far overpriced.
I have some(Amazon warehouse $8 deal).
I swear it's just acetone with enough ketone to throw off the acetone smell.
https://www.amazon.com/EternaBond-Ou...s%2C817&sr=8-8
Here it is for $12 as a warehouse deal.
The can should last doing small repairs for as long as you own the RV.