I'm not sure what eco-friendly means in terms of using a chemical product like polyester or epoxy resin.
From the user point of view, probably the most eco-friendly thing that you can do is to learn to use as little adhesive as possible and still get the job done. Avoid coating surfaces with epoxy and use as little glass as much as possible. Having said that, glass and epoxy is an amazing building material.
I get my boatbuilding epoxy from raka.com, it is cheap and a high quality product.
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