Concrete on bottom of hulls

I purchased a boat from a dealer that rents cats at the beach, and to protect the hulls, the dealer put a protective material on the bottom of the hulls. I would like to take it off.

It is medium dark grey, and hard as rock. Any ideas as to what this stuff is? and any ideas on how to safely remove it?

Thanks!

Please post some pics for proper diagnosis.

maybe some sort of antifouling paint?

Possibly a product I used many years ago known as 'Ceramkote'. But the greenish color in the photo does look like anti-foul with copper element.

Wow that's crazy looking. where it changes height can you tell if there are vertical seams ? like it's separate pieces? or does it seem to be all seamless? maybe the top is like a masking line and it's bed liner, with paint on it that has faded and worn off. it looks textured when I zoom in on the black areas?

edited

You can go back and edit the post to delete the photo.

I don't have any good pictures of the material. But if you can imagine flipping your hulls over to do bottom work, apply a 1 inch wide stripe, about 1/8 inch thick, of this epoxy material, on the surface that typically gets ground down when dragging on the beach. You can barely see it when the boat is on the trailer, as it is only on the bottom.

I spoke to the dealer (Ocean Motion) and they stated it is Iron-crete from Mantek.

http://www.mantek.com/productView_byCategory.asp?cat_id=11&cat_desc=Products&country=USA&language=English&language_id=4&countryName=United+States&pName=IRON-CRETE

They also stated it might chip off. They have had some of this stuff fall off.

I suppose I need to be prepared to restore the bottom finish when I get this stuff removed.

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