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Old 20-04-2012, 19:46   #1
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Dow Corning 795

Just ordered a case of it to rebed the hatches. What do you guys think? Just use it for the frame to fiberglass bit? Can I use it to bed the glass in the hatch as well or should I use some glazing compound? My side lights are just plexiglass bedded right to the fiberglass, can I use it there? they have a stainless trim piece that fits over the seam but does nothing for actually sealing the window. I can provide pics if that would help tomorrow.
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Old 20-04-2012, 20:14   #2
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Re: Dow Corning 795

Do not think you will find much love of silicone caulk/sealers on this forum.

One big problem, if you ever have to redo any of the hatches it will be almost impossible to get anything to stick where you have previously used silicone, even more silicone won't adhere well.
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Old 20-04-2012, 20:27   #3
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Re: Dow Corning 795

You got the right stuff. Dow 795 is one of the best for the job, the other being Sika 295 UV but this needs the primer.
I am redoing my ports and I am using D795 to bed the acrylic to the aluminium frame and then the frame will be bedded with Butyl. Just clean the surfaces thoroughly, clean the lenses with a 50/50 mix of alcohol and water anything else will hurt it.
Do a search for Dow 795, lots of threads on how to use it on hatches/ports.
Good luck.
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Old 20-04-2012, 20:29   #4
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Re: Dow Corning 795

Actually, Dow 795 is the correct stuff to use to bed the acrylic lenses to the hatch or the acrylic lenses to the fiberglass.
Do a google search for bedding portlights.......there's a good write up using this stuff.

I have also used it on the hatches......it is the correct stuff for the lenses, not for the frames to the deck though.
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Old 21-04-2012, 03:31   #5
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Thanks guys,
Any name brands for the frame to boat bedding?
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Old 21-04-2012, 04:28   #6
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Re: Dow Corning 795

TremCo commercial glazing system butyl tape.
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Old 21-04-2012, 06:21   #7
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Re: Dow Corning 795

For bedding hardware to the deck, first look here:

Bedding Deck Hardware With Bed-It Butyl Tape - SailboatOwners.com

Then buy the butyl from him - Maine Sail here:

Need Butyl Tape ?? Photo Gallery by Compass Marine at pbase.com
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Old 21-04-2012, 08:35   #8
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Re: Dow Corning 795

Quote:
Originally Posted by DSDman View Post
My side lights are just plexiglass bedded right to the fiberglass, can I use it there?
I used 3M VHB Foam Tape-Adhesive #4991 to secure the plexiglass to the fiberglass with Dow Corning 795 as a sealant and secondary adhesive.
Extremely strong, yet flexible!
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Old 21-04-2012, 08:43   #9
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Re: Dow Corning 795

I used perhaps the wrong stuff- 5200 3-m- but was all I had in a location I could not get the right stuff- works great as long as I never have to pull the hatch out of the deck
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Old 21-04-2012, 14:17   #10
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Re: Dow Corning 795

Quote:
Originally Posted by DSDman View Post
Just ordered a case of it to rebed the hatches. What do you guys think? Just use it for the frame to fiberglass bit? Can I use it to bed the glass in the hatch as well or should I use some glazing compound? My side lights are just plexiglass bedded right to the fiberglass, can I use it there? they have a stainless trim piece that fits over the seam but does nothing for actually sealing the window. I can provide pics if that would help tomorrow.
I can't seem to find the stuff here in Canada and the US on-line sellers want more for delivery than the cost of the product.

Anyone willing to sell me a tube and I will pay for actual cost shipping? Currently the best I can do is $36 for one tube delivered to Vancouver!

I have a porthole leaking rain into the boat at the moment so taped it up temporarily.
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Old 21-04-2012, 18:21   #11
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Productive day at the boat! Removed old refrigeration system and holding plates... and sink. Also removed another hatch and took up some of the teak around it. Teak was actually easy to get up only two screws per piece of wood. Tried to find the butyl tape and maybe a tube at lowes,

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no luck , internet it is.
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Old 22-04-2012, 07:14   #12
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Re: Dow Corning 795

Quote:
Originally Posted by eliems View Post
I can't seem to find the stuff here in Canada and the US on-line sellers want more for delivery than the cost of the product.

Anyone willing to sell me a tube and I will pay for actual cost shipping? Currently the best I can do is $36 for one tube delivered to Vancouver!

I have a porthole leaking rain into the boat at the moment so taped it up temporarily.
Eliems, I picked up the tubes in the US. In Canada you can find Sika 295 UV with the primer, just as good.
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