Wagon, Seaboard is a great product heavy but very durable. In the marine industry of which I am very familiar no one will use a sealant on it as it will not stick for very long. It is to be mechanically fastened (screws, botls) or heat welded actually melts the bits together. Any plastic fab shop will verify this.
Now if you have had success in sealing then more power to you. I feel that you are very lucky. I would really like to see pictures and what sealnt did you use, and how is it secured in toality, screwed down, botl thru...Pls supply more details. I am truly in awe if you have it working. THX for your input.
