Problem with epoxy pumps

Discussion in 'Boat Yard Basics' started by Bush_Whacker, Jan 21, 2012.

  1. Bush_Whacker

    Bush_Whacker I Love!

    I went to mix a little epoxy today and the pump for the hardener is not giving a full stroke. Every other pump is fine, but the rest are "spits". Looks like I'll be picking up a small digital scale to measure the weights of the epoxy and hardener from now on. Does anyone know the weights of the two, or the ratio's? I'm using West Systems 105 epoxy and 206 hardener.

  2. Brett

    Brett > PRO STAFF <

    Don't like pumps for just that reason. Can't trust the mix ratios.
    I decided to go with disposable plastic cups for measuring and mixing.
    Easy enough to mark a reference cup at 1 oz intervals and mark the mix cup
    at the levels needed for a 5:1 ratio.


  3. Bush_Whacker

    Bush_Whacker I Love!

    Thanks Brett. Good tip on the cups.
  4. Brett, Im guessing you got those cups at a paint store? I can't find any that small at Home Depot.
  5. Brett

    Brett > PRO STAFF <

    Grocery store, translucent 9 ounce Solo cups, on the shelf next to the paper plates.
  6. DuckNut

    DuckNut Brandon, FL

    I use the 1oz disposable graduated shot glass style measuring cups for small work. Use the same as Brett for larger.
  7. oysterbreath

    oysterbreath Well-Known Member

    I use the pumps. Got mine at west marine and I've had no issue with them but me being me...I pump into cups then mix. They do seem to be accurate though. I get my cups at the dollar store. I also buy the plastic bowls. Those are good for mixing thickened epoxy (peanut butter thickness) because mixing thick epoxy in the cups causes them to collapse. I also use dollar store measuring cups.
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