Thanks MaineSail, now that you mention it, I had read his site. I sent him an email seeking advice but he never replied. I'll phone him next week.
Here is what you referred to:
Never ever bolt a plastic portlight in place. Screws are fine to hold a lens till the adhesive cures. Take them out asap and fill the holes with the afformentioned products. Both of these products are rated at 700 + percent elongation before tear. Strong flexible and UV resistant. Kinda like me!
So his position is that if I use adhesive to hold an acrylic dead light in place, this will be strong enough? My concern was that these are 45 inch dead lights, and I was thinking that they add to the structural integrity of the deck. I don't have much experience with adhesives, what if I want to remove it later?
If I end up using adhesives, the project may have to wait for several weeks until we have temps continually exceeding 50 deg F