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  1. #1
    Join Date
    Mar 2004
    Posts
    6,062

    Default sticking polycarbonate sheeting down

    flat horizontal hatch on a flat GRP opening

    i am unlikely to need access in the next few years, happy to tear it open if needed
    i can drill and screw it, but the stuff expands, don't want any stress fractures

    so would like to 'just' stick it down

    what product should i use ?

  2. #2
    Join Date
    Dec 2001
    Location
    Grenoble
    Posts
    31,662

    Default Re: sticking polycarbonate sheeting down

    Superglue should do it

  3. #3
    Join Date
    Jul 2018
    Location
    Bewdley, Worcs
    Posts
    508

    Default Re: sticking polycarbonate sheeting down

    Sikaflex 295UV with a suitable primer, such as "Sikaflex MultiMarine" or possibly "Sika 209 D"

    Use rubber spacers to make sure you maintain at least a 5mm bond layer, 295UV is flexible and will allow the panel to expand and move without stressing the substrate.

  4. #4
    Join Date
    Oct 2012
    Location
    Southminster, essex
    Posts
    9,415

    Default Re: sticking polycarbonate sheeting down

    Why not drill oversize holes & screw the screws through these with oversized sealed caps?
    Could use sheet metal decking screws as they have rubber sealing washers.

    The material can be bonded using one of the following adhesives: Epoxy, Polyurethane, Hot Melt or Silicone.

    Expansion rate can be found at :-
    https://www.specifiedby.com/brett-ma...ochure-eng.pdf
    Last edited by Daydream believer; 10-09-19 at 17:30.
    It is all down to the fact that my wife does not understand me !!

  5. #5
    Join Date
    Jul 2018
    Location
    Bewdley, Worcs
    Posts
    508

    Default Re: sticking polycarbonate sheeting down

    Quote Originally Posted by Daydream believer View Post
    Why not drill oversize holes & screw the screws through these with oversized sealed caps?
    Could use sheet metal decking screws as they have rubber sealing washers.
    Personally, I have always found that drilling more holes in boats makes them wetter, not drier, and I rather got the impression that the OP was looking for a way to keep wet .. out.

    We went to considerable lengths last year to replace the windows on our boat that had been previously bolted in with a couple of hundred through bolts and caps ... with boltless windows, glued in. No leaks!

  6. #6
    Join Date
    Jan 2004
    Location
    kefalonia ,greece
    Posts
    754

    Default Re: sticking polycarbonate sheeting down

    What sort of glue did you use ?
    I have tried 295 UV and had to put screws in as the polycarb expanded more than the coachroof ,
    which caused the seal to break
    and in came the water again .
    grafozz

  7. #7
    Join Date
    Mar 2004
    Posts
    6,062

    Default Re: sticking polycarbonate sheeting down

    tnx guys, yes more holes = more leaks

    looking at this:

    https://www.screwfix.com/p/dow-799-g...ar-310ml/66307

  8. #8
    Join Date
    Nov 2001
    Posts
    4,159

    Default Re: sticking polycarbonate sheeting down

    Quote Originally Posted by simonfraser View Post
    tnx guys, yes more holes = more leaks

    looking at this:

    https://www.screwfix.com/p/dow-799-g...ar-310ml/66307
    I think you are on the right track with the Dow sealant, but unless you use a frame of some type you are going to have on-going problems with expansion.

    Regards
    Donald

  9. #9
    Join Date
    Apr 2004
    Location
    Portchester, Solent
    Posts
    5,013

    Default Re: sticking polycarbonate sheeting down

    No experience of this but may work...
    https://www.ebay.co.uk/itm/POLYCARBO...4383.l4275.c10

  10. #10
    Join Date
    Jun 2004
    Location
    Portugal
    Posts
    651

    Default Re: sticking polycarbonate sheeting down

    Quote Originally Posted by alahol2 View Post
    No experience of this but may work...
    https://www.ebay.co.uk/itm/POLYCARBO...4383.l4275.c10
    +1
    I think I would be using this. Looks like the correct stuff for the job. Not too expensive and metal cars and polycarb windows expand/contract at different rates I'm sure.

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