I have been using this for some time. It
is not fast acting. I usually let it sit overnight.
It will be all dried up so you scrape off what
you can. Then wet what is left with soap
water to remove what remains. Sometimes
you might need a second application depending
on how thick what your removing is.
Tubs
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.