Hi,

EC's "Water clear Polyester casting resin"  will probably be the cheapest way, and very strong, but being a polyester it will smell for some time.

EC's Water clear Polyurethane casting resin may also fit the bill, but it is much more expensive.

The best I've ever used was "Wessex Resins Permakote" which is a water clear Epoxy ... but how much better it is than the EC Polyurethane, i have no idea.
price seems to be about the same..

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The problem with both of the products in our experience is long term durability for a piece that gets used.  Both the products can easily scratch and will end up with rings in if hot drinks cups are regularly left in contact.

For cosmetic decorative pieces with little use, then great the two products will work fine within the limits of thier own characteristics.

We are currently trying to develop a better waterclear casting resin especially for the table top/bar top/floor coating purposes as it has recently become very popular due to a few famous bars and resturants with clear floor/table centre pieces with coins or similar.

Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant