Dow Corning 795 vs GE SCS1200

[AiniA]

I want to attach plexiglas to powder coated aluminium. My research so far suggests that both 795 and SCS1200 are suitable for the task. The manufacturers' descriptions of the two seem very similar. Is one better than other?

[Hudson Force]

I'm preparing for a similar task, although fixing acrylic to fiberglass, and I was recommended the use of Dow 791. I know this is not helpful to just add another sealant to the question, but I'm looking forward to reading the advice concerning this question.

I should add that these sealants are secondary to the main bonding accomplished with 3M VHB 4991 2.3mm tape. I think the best adhesion would be with the tape and the choice of sealant for finishing the edge.

[AiniA]

I may use the tape for some of the things I am doing but all of the acrylic bits are installed in Bomar aluminum frames and some of the frames do not seem well setup for tape. Obviously when they made the tape did not exist and they are designed for goop instead. Dow 791 is more of a sealant while 795 is more of a sealant/adhesive.

[Hudson Force]

AiniA, Thanks for that 791 and 795 contrast that is off the track of your question. I was not aware of that difference.

[Wainui]

Used DC 795 on Bomar and Lewmar Hatches.
Easy to use, strong as and cost $7.50 a tube.

[skipmac]

I did exactly the same, new Plexiglas (or acrylic to use the generic term) in powder coated portlights. I researched all the options and found this website and learned that this company comes highly recommended. Blog – Selectplastics

So I ended up using Dow 795 and the results were excellent. Four years and not a drip. I found an online construction supply company that sold me the 795 super cheap. Also comes in a very wide range of colors if you want to match the hatch frame, trim or even the settee cushions.

NOTE: this stuff is really, really messy. Don't even open a tube within 100 yards of anything you don't want it to get on. Were disposable clothes and gloves. Tape everything on the frame or parts you don't want covered with goop. Tape the edges of the joints so you can peel off the tape and leave a nice edge.