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  1. #1

    Proper sealant to use on hatch between “glass” and aluminum frame

    What is the proper sealant to use between the Lexan ?? And the aluminum frame of the hatch. These are bow hatches. Thanks for your time.

  2. #2

    Re: Proper sealant to use on hatch between “glass” and aluminum frame

    What's the aluminum coated with?
    Scott
    41C117 "Hattatude"
    Port Canaveral Florida.


    Marine Electronics and Electrical Products Distributor.

  3. #3

    Re: Proper sealant to use on hatch between “glass” and aluminum frame

    I don’t know.

  4. #4

    Re: Proper sealant to use on hatch between “glass” and aluminum frame

    lexan is Polycarbonate and I believe pure silicone is a good sealant. Aluminum could be painted, powdercoated, anodized or clean.

    Im not sure whats best for that bond.

    BobK please chime in.
    Scott
    41C117 "Hattatude"
    Port Canaveral Florida.


    Marine Electronics and Electrical Products Distributor.

  5. #5

    Re: Proper sealant to use on hatch between “glass” and aluminum frame

    I’ve seen silicon and 4200 used.
    SEVEN
    1979 53' MY Hull #563
    Antioch, California

  6. #6

    Re: Proper sealant to use on hatch between “glass” and aluminum frame

    Thank you both for your help. I really appreciate it.

  7. #7

    Re: Proper sealant to use on hatch between “glass” and aluminum frame

    Quote Originally Posted by Boatsb View Post
    lexan is Polycarbonate and I believe pure silicone is a good sealant. Aluminum could be painted, powdercoated, anodized or clean.

    Im not sure whats best for that bond.

    BobK please chime in.
    Polycarbonate is very easily damaged by some solvents. I would check with a plastics supply house rather than reinvent the wheel. It is also not very UV resistant.

    Silicone caulks come in several flavors. The common one releases acetic acid when it cures which may damage the aluminum. An architectural polyurethane may be best if it will not damage the PC.

    Bobk

  8. #8

    Re: Proper sealant to use on hatch between “glass” and aluminum frame

    `Dow 895 is what is used by most that rebuild them.....Pat

  9. #9

    Re: Proper sealant to use on hatch between “glass” and aluminum frame

    I don't know about Dow 895, but I use Dow 795 which is a commercial grade silicon, my entire aft deck enclosure is put in with the 795. It is plexiglas but it is also good for lexan and regular glass. As I understand it the windows in skyscrapers are glued in with 795. Only problem with it is can be hard to find. We found a place that was a boulders supply and they sold it to me at wholesale pricing and it was surprisingly cheap. The guy that replaced my solid glass windows on my last boat used it also. John
    Mahalo V
    1974 53 Motoryacht
    Hull Number 406
    San Diego, Ca. Ready 32 Nordic Tug, Brunswick Ga.

  10. #10

    Re: Proper sealant to use on hatch between “glass” and aluminum frame

    Boatlife Life seal. Its a combination silicone/polyurethane. Its safe for Lexan. I used it on my hatch years ago and its still watertight.

    Read about it here:

    http://www.boatlife.com/lifeseal-sealant-cartridges/
    Sky Cheney
    1985 53EDMY, Hull #CN759, "Rebecca"
    ELYC on White Lake--Montague, MI

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