Removing Cement From Gelcoart ... Safely

The map pockets on the inside of my DG has fallen apart over the
years. It is made ut of some type of leather like material and
cardboard as an interior stiffner. I am unsure what I will replace
this with as yet.

I removed the old pockets and was left with some brown adhesive on the
interior gelcoat. If I was to guess it is something like Pliobond.

So the questions are, what is the adhesive and more importantly how to
remove it. I have scrapped off what I could but want to get back to
the bare gelcoat.

Thanks in advance for any help.

Thanks, John DeRosa
john at derosaweb.com