Acrylic Hatch Sealant

[SirMichael]

The topside hatches on my 88' Hunter 28.5 were getting pretty badly glazed so I replaced the acrylic last winter. I'm not sure what I used to seal the new acrylic into the hatch frames with. I'm guessing it was some black silicon. Both started leaking this last summer (puddles underneath after rains), probably from the heating and cooling between sun and night.

I'm going to pull them off again and re-seal them.
What should I be using to seal them?

Sir Michael

 

[JBP-PA]

The usual contenders are
Dow 795 silicone
3M 4000 UV polyether
Sika 295 UV polyurethane

 

[SirMichael]

Thanks for the info!
I'll pick one of them and get it ordered.

Sir Michael

 

[Georgedoyle]

I used the Dow 795, and it worked out great. That was four years ago. Still looks good.

 

[SirMichael]

You know...the more that I think about it, I'm pretty sure that I used the 3M 4000 when I installed the acrylic in the aluminum frames...
I ordered the Dow 795, I'll try that this time.

Sir Michael

 

[Georgedoyle]

I'm pretty sure we ordered it from the Sailboat Owners webstore.

 

[Crazy Dave Condon]

Dow 795 was the preferred sealant by the industry.

 

[Richard19068]

About 15 years ago I used Boatlife Life seal (not Life caulk) to install a window in my foredeck hatch. It has worked very well. No leaks and still looks to be in good shape.

 

[Blitz]

About 15 years ago I used Boatlife Life seal (not Life caulk) to install a window in my foredeck hatch. It has worked very well. No leaks and still looks to be in good shape.

I have had similar experience Boatlife Life Seal, works well. Be aware of the full drying time though