Refrigeration vacuum pump for drying out GRP

Discussion in 'Fiberglass and Composite Boat Building' started by WHumphreys, Jul 30, 2009.

  1. WHumphreys
    Joined: Jul 2009
    Posts: 22
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Bolton, UK

    WHumphreys Junior Member

  2. Andre_F
    Joined: Jan 2017
    Posts: 1
    Likes: 0, Points: 0, Legacy Rep: 10
    Location: Ontario, Canada

    Andre_F New Member

    Hi fiberglass jack, can you give some details about your vac pump? I have a Lightning sailboat that i fear may have water in the hull so i am looking at options. I am getting a Skipper+ moisture meeter as a start of exploring my options. Thanks
     

  3. PAR
    Joined: Nov 2003
    Posts: 19,133
    Likes: 478, Points: 93, Legacy Rep: 3967
    Location: Eustis, FL

    PAR Yacht Designer/Builder

    I missed this one years ago, but WHumphreys has it figured out. The blistering process is a chemical reaction, within the laminate. The chemical changes that occur, cause the blistering, as well as environmental changes (freeze/thaw cycling). Pulling a vacuum can remove some of the moisture, though you'll need to leave it under a good suck, for quite a while to get most of it, as it's got to drag it through the laminate matrix. Simply put, pulling a vacuum can help, but isn't a guarantee. Peeling a whole hull is a huge expense and not a job recommended for anything but experienced pros. A novice can do it, but you'll be fairing your brains out for some time.

    For your Lightning, consider addressing the blisters as they arise and conventionally. Grind them out, dry them out, then make standard localized 'glass repairs, as required. This will save you tons of time and materials, trust me. Will the blisters return, yep, some will and new ones may show up, but wholesale peeling of the hull and bagging is a whole different can of worms, that needn't be opened if you can avoid it. Most blister jobs just require they be opened up and repaired, so the first go around will get the majority of them.
     
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