Question: 17 ounce (no mat) biax, over mat with polyester?

Discussion in 'Fiberglass and Composite Boat Building' started by Pylasteki, Apr 25, 2013.

  1. Pylasteki
    Joined: Apr 2008
    Posts: 74
    Likes: 3, Points: 8, Legacy Rep: 42
    Location: North Carolina

    Pylasteki Junior Member

    Hi Guys,

    I'm getting ready to put a new cockpit into my sailboat using polyester. I'm laminating up some full size 4x8 sheets and use it like plywood. I cut down my last roll of 1708 to fiberglass in some toe rails on another job, so it is no longer a full 50 inches...

    I'm curious if there are any any reasons not to use 17 ounce with no mat backer over a layer of wet mat, other than its going to make a big mess? :D

    I have a roll of 1700 biax (no mat), a roll of 3/4 ounce mat, and a roll of 1 1/2 mat and don't really want to buy 1708 just for this job, unless 1700 can't be used with poly even if bedded down into mat.

    Thanks

    Zach
     
  2. gonzo
    Joined: Aug 2002
    Posts: 13,725
    Likes: 418, Points: 93, Legacy Rep: 2031
    Location: Milwaukee, WI

    gonzo Senior Member

    It shouldn't make a mess. You can laminate the fabric to the mat. If you use a finished surface to lay the laminate (formica) it will have a nice finish that will require little work.
     
  3. ondarvr
    Joined: Dec 2005
    Posts: 2,083
    Likes: 185, Points: 63, Legacy Rep: 506
    Location: Monroe WA

    ondarvr Senior Member

    You can use the 1700 with a separate layer of mat, putting the two together in one product is just for convenience.
     
  4. Pylasteki
    Joined: Apr 2008
    Posts: 74
    Likes: 3, Points: 8, Legacy Rep: 42
    Location: North Carolina

    Pylasteki Junior Member

    Thanks for the replies, I had never heard of a reason not to do it... but also never heard of anyone doing it either so didn't know if it was kosher. Grin.

    Thanks,

    Zach
     
  5. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 472, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    Typically, it's an alternating mat/roving laminate so the interlaminte bonds are good. Depending on your schedule, you'll need a lot of material to work like plywood (self supporting, stiff, strong and fairly light). Used in this fashion, you'll likely need a core (foam, honeycomb, etc.), to keep weight down and dramatically improve stiffness.
     

  6. Pylasteki
    Joined: Apr 2008
    Posts: 74
    Likes: 3, Points: 8, Legacy Rep: 42
    Location: North Carolina

    Pylasteki Junior Member

    Yup, I have some 3/4 divinycell I'm going to use... just giving it a go with polyester instead of epoxy, that I'm much more familiar with.

    Thanks,

    Zach
     
Loading...
Similar Threads
  1. Anthony212
    Replies:
    6
    Views:
    237
  2. Midday Gun
    Replies:
    5
    Views:
    291
  3. atengnr
    Replies:
    46
    Views:
    815
  4. fallguy
    Replies:
    2
    Views:
    253
  5. fallguy
    Replies:
    5
    Views:
    458
  6. Andrew Courtney
    Replies:
    3
    Views:
    409
  7. JohnMarc
    Replies:
    7
    Views:
    509
  8. Bullshipper
    Replies:
    7
    Views:
    712
  9. GP1998
    Replies:
    17
    Views:
    1,917
  10. freddagg
    Replies:
    15
    Views:
    985
Forum posts represent the experience, opinion, and view of individual users. Boat Design Net does not necessarily endorse nor share the view of each individual post.
When making potentially dangerous or financial decisions, always employ and consult appropriate professionals. Your circumstances or experience may be different.