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If filling a piece of natural wood with grooves in with resin - clear or coloured - what is the best kind to use? This would need to allow for the wood to be used as a table top.

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An epoxy resin, or polyepoxide: a resin mixed with a hardener.
This can be used both for filling in gaps in wood as well as encasing wood.

Epoxy can give wood a waterproof, resilient finish. In most cases, it is an ideal coating for wood projects that will be exposed to moisture or wear. (source)

Some epoxies are intended for use with wood, or, more specifically, wooden furniture (called 'tabletop epoxy', for example), and will be clearer, more UV-resistant, and less prone to forming bubbles.

Whether coloured or clear is a matter of taste.

If you're thinking of casting the entire piece of wood in resin, you can calculate how much you are going to need here (NB that's a commercial website).

  • When I was doing carpentry we used a lot of West System Epoxies. They have multiple types of fillers to do exactly this. – rebusB Feb 19 at 17:22

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