I first coated all the wood with a product call S-1 which is a epoxy with very low viscosity which basiclly all the wood is sealed (can not tint or color this product), at this point if I wanted to I could have just siliconed the joints and filled her up but this I did just for back up in case the main coating failed. The second thing I did was all my viewing windows which are glass I did the perimater in an epoxy call cold cure which you can tint any color you want and which you can silicone the glass to it. My top layer I use a product called Blue Max which is just trowel on liquid rubber and it is blue. So now the reason behind the different products is that the blue max will bond to epoxy and so does silicone but silicone dose not bold to the blue max so you need that transicion product. That S-1 is great for sealing up the canopy or air space above as well, All my tanks have closed type conapys and my average house humidiy is about 40-55% depending on what the weather doing outside.