What's inside my swim platform?

So, wifey bought us a grill for our 2009 280 Express Cruiser.   After much debate and discussion, it has been decided that the best mounting method for us will be a pedestal mount on the starboard side of the swim platform.  My questions are:
1.  What exactly is "inside" my platform?  Foam?  Wood?  More fiberglass?  Empty space?  I'm assuming that there isn't anything "important" there that I shouldn't drill into, but I'm not positive.
2.  Does anybody have any advice on how I should go about drilling/sealing the holes for the mount?  
Any tips/tricks would be appreciated.
As always, thanks in advance.  I've been helped numerous times on this forum.

Comments

  • Black_DiamondBlack_Diamond Holland, MichiganPosts: 4,712Member ✭✭✭✭✭
    Should be wood sandwiched by the fiberglass. Sealing properly is critical. Do not use anything with silicone in it. Personally, I am a big fan of butyl tape. 

    2003 342FV "Black Diamond", 350 MAG MPI, 20P 4x4 Props, PC BYC, Holland, MI
  • Cableguy GregCableguy Greg Pittsburgh, PAPosts: 4,019Member ✭✭✭✭✭
    It is thicker than you think. I used 3 inch 1/4 x 20 oval head stainless bolts with fender washers and nylon lock nuts on the back side. Where I mounted my grill, there is a support that runs across the platform, so I had to use two screws in there. I sealed the holes with 3M 4200.



    2008 280 Express Cruiser, 6.2MPI, B3, Pittsburgh, PA "Blue Ayes"
    Go Steelers!!!
  • redlightningredlightning Beaver Lake ArkansasPosts: 188Member ✭✭
    what is the reason for not using silicone.  I have seen this mentioned on other threads. 
    2008 330 Express Cruiser
  • Handymans342Handymans342 Posts: 7,757Member ✭✭✭✭✭
    Silicone does not provide a waterproof seal as good as 4200 or 5200. Remember, 4200 above the water and 5200 below the water. 
  • Black_DiamondBlack_Diamond Holland, MichiganPosts: 4,712Member ✭✭✭✭✭
    Silicone also stays with the gelcoat. You have to abrasively remove it, nothing else will ever seal correct again otherwise. There are good marine caulks too. The plus with butyl tape is it is removeable and never hardens. I'll post a link about it seperately. 

    2003 342FV "Black Diamond", 350 MAG MPI, 20P 4x4 Props, PC BYC, Holland, MI
  • Handymans342Handymans342 Posts: 7,757Member ✭✭✭✭✭
    I wouldnt use the tape on the swim platform. 
  • Black_DiamondBlack_Diamond Holland, MichiganPosts: 4,712Member ✭✭✭✭✭
    Read this, you'll change your mind.  I rebed almost all my bow rail mountings with it, all my deck hatches, my dinghy davit too.

    http://www.pbase.com/mainecruising/rebedding_hardware&page=1


    2003 342FV "Black Diamond", 350 MAG MPI, 20P 4x4 Props, PC BYC, Holland, MI
  • YYZRCYYZRC Georgian BayPosts: 118Member
    Bringing this thread back to life.  Cableguy Greg said:
    It is thicker than you think. I used 3 inch 1/4 x 20 oval head stainless bolts with fender washers and nylon lock nuts on the back side. Where I mounted my grill, there is a support that runs across the platform, so I had to use two screws in there. I sealed the holes with 3M 4200.



    @Greg, if you were to do it again, would you still bolt all the way through the platform?  I plan to mount my BBQ in approximately the same place on my 330EC.

    Thank you.
  • Cableguy GregCableguy Greg Pittsburgh, PAPosts: 4,019Member ✭✭✭✭✭
    Yes I would. I would rather have it through bolted than just screwed into the fiberglass. 
    2008 280 Express Cruiser, 6.2MPI, B3, Pittsburgh, PA "Blue Ayes"
    Go Steelers!!!
  • PickleRickPickleRick Posts: 536Member ✭✭
    edited October 13
    Do you know anyting about thickened epoxy resin?  If you over drill all the holes then fill with thickened epoxy resin, then drill your mounting holes then. End result, if the 4200 or butyl tape ever leaks then the water will never reach the wood.  

    I consider this method mandatory for all transom mounted parts. 
  • YYZRCYYZRC Georgian BayPosts: 118Member
    edited October 13
    If I could hit the integrated support beam with two of the screws like you did, I would be confident enough in the strength to not worry about drilling all the way through.

    Has anyone ever taken a studfinder to the platform to try to find the supports? 

    I really wish my boat was here already... in the meantime I'm living vicariously through Aero!
  • aero3113aero3113 Long Island, NYPosts: 2,907Member ✭✭✭✭✭
    YYZRC said: I really wish my boat was here already... in the meantime I'm living vicariously through Aero!
    LoL!! Fell free to ask any questions!
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