On episode 7 of the Charlestown Row House Restore Tom and Norm used an epoxy to seal between the two boards of the front porch steps. What is this product, name, where to purchase?:
I've used West Systems epoxy outdoors. Available in any boat store. Other brands too. Not UV resistant. Needs to be painted if exposed.
I have used the Abatron WoodEpox to repair a couple of rotting window sills. It worked great and made replacing these 3rd floor sills much easier.