Laminating gelcoat is hard in 16 hrs??

Discussion in 'Materials' started by burke, Feb 19, 2017.

  1. Mr Efficiency
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    Mr Efficiency Senior Member

    Adding filler must affect the permeability of the gelcoat ?
     
  2. ondarvr
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    ondarvr Senior Member

    If you're referring to the Cabosil, it's a normal ingredient in gel coat and resin to adjust them into a usable viscosity, infusion resins would be about the only ones without this type of silica.
     
  3. Mr Efficiency
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    Mr Efficiency Senior Member

    OK, so extra thickener added to brushed gelcoat to get the requisite thickness in one go, does not create any problem of greater permeability ? You clearly know more than most about this subject.
     
  4. ondarvr
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    ondarvr Senior Member

    It's not that it doesn't or can't have an effect, it's just that it's already in the mix. If the silica isn't wet out by the resin correctly it would be possible for it to wick water quicker, the amount added to thicken the gel coat wouldn't be a problem if it was mixed in well. If it was thickened with talc or other fillers it could create a problem. But most things added at low levels don't have a huge affect, although in lab testing it might be noticeable.
     
  5. Mr Efficiency
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    Mr Efficiency Senior Member

    Thanks for that, it seems that the effects of adding "solids" is not just dependent on the amount, but the type of solid. I've had little to do with gelcoat, preferring to paint after moulding.
     
  6. kapnD
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    kapnD Senior Member

    Damn, I gagged at that!
    I knew there was a reason that I haven't eaten at McD's for over 20 years.
    I won't even take the lid off my cabosil container without putting on a respirator, and I mix it in a closed container with a small hole for the agitator shaft.
     

  7. ondarvr
    Joined: Dec 2005
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    ondarvr Senior Member

    Fumed silica (Cabosil, Aerosil) is a food grade product used in many things, ketchup, Mustard, BBQ sauce, or anything else that needs to be thickened with a non nutritional food additive, with no flavor.
     
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