How long to leave a new mold before demolding

Discussion in 'Fiberglass and Composite Boat Building' started by alibi, Jul 13, 2009.

  1. alibi
    Joined: Oct 2008
    Posts: 12
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: New Zealand

    alibi Junior Member

    Hi I've just finished a vinylester/polyester boat mold 20ft in size,

    How long do I need to leave it to post cure for before pulling it off the plug?

    Cheers
    Any help much appreciated
     
    alibi, Jul 13, 2009
    #1
  2. JRL
    Joined: May 2007
    Posts: 83
    Likes: 2, Points: 0, Legacy Rep: 25
    Location: Palm Beach Gardens, FL

    JRL Im with stupid

    Most resin systems say full hardness in 7 days. The majority of your off gassing/shrinking should happen during that time. With a project that big I wouldnt want to take any chances demolding early.

    Although I've demolded after one day and had zero problems (on small parts). I have ruined a 9' layup due to my boss wanting to demold after 24 hours. Was way to flimsy.
     
    JRL, Jul 13, 2009
    #2
  3. tunnels

    tunnels Previous Member

    How long is not the point its cure of the resin used you are looking for . You need to warm the mould to about 30c plus and hold that temprature for 12 hours if possible so build a tent over it ,get a blower heater and gently cook it then let it completely cool out ,then demould .:D
     
    tunnels, Jul 19, 2009
    #3
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