... and DO NOT use standard sealants like 4200, 5200 or any of the others. If there were a better sealant for cast acrylic Tony would mention it. Use Dow 795, GE SG 4000 or Sikaflex 295 UV with the special primer.
I'm not trying to start an argument, and I am new to this and only really know what I have read. I spoke with Tony at Select Plastics at length and he is clearly very knowledgeable. MainSail and SailingDog, and many others here, are also very knowledgeable.
So my question is, why the big disagreement on silicon, at least for this purpose. SD has said over and over (and he cites good reasons) that silicon has very few uses on a boat, those perhaps being limited to the tips of cotter pins and the underside of dishes.
Tony and Mainsail, at least for this purpose (bonding acrylic dead lights to gel coat) say Dow 795 (silicon) is the way to go. And, the Dow data sheet does say that 795 is suitable for bonding glass to buildings in high wind applications, but buildings are not made from gel coat.
Another poster here commented that perhaps the issue with silicon is limited to that which has the vinager smell.
And then there are the products that have some silicon in them.
Is this just a difference of opinion, or is using silicon to bond the windows one of those exceptions where it is appropriate? If the later, what happens when it is time to rebed or reseal them?
I don't mean to start a war or be a pain, but I am in the process of replacing dead lights. If I don't use fasteners of any type, and the dead light pops off while I'm on my ear, the boat could easily sink as water rushes through the 45 inch opening that is left behind. Hence my concern not just for the initial installation, but the quality of the bond should it need to be done again. So if the silicon makes it difficult to reseal later, I would prefer to use something else, even if just for my own mental calmness. If there is a reason the silicon is not an issue, then so much the better.