There's a lot of different epoxies that can be used as a bedding compound out there. Nearly all of them have some shrinkage over time. Belzona 1111 has zero shrinkage and is the best I've ever used and is like steel when set, but it's apparently about $350 a small tub. Black Marinetex is good too and easy to work with and is around $100 if you import it from the U.S.
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