Kate Parlee
New Member
I've been using the pumps for over forty years as a professional boat builder and never had a problem.
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"You need a digital scale to get the epoxy mixed correctly. The pumps used in the West System are crude at best. Excess heat is usually caused by too much hardener but ambient temperature also plays a role.
The #105 epoxy resin is mixed in a 5:1 ratio with the #205 and #206 hardeners, and a 3:1 ratio with the #207 hardener"
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That 5/1 ratio is for volume.
For ratio by weight:
Resin weighs 9.6 lb/gallon and 206 catalyst weighs 8.45 lb/gallon
By volume the ratio is 5/1 resin/catalyst, so 1 gallon of resin requires .2 gallons of catalyst.
.2 gallons of catalyst weighs (8.45 x .2) = 1.69 lbs
So the resin/catalyst ratio by weight is: 9.6/1.69, or 5.7/1
=====
"You need a digital scale to get the epoxy mixed correctly. The pumps used in the West System are crude at best. Excess heat is usually caused by too much hardener but ambient temperature also plays a role.
The #105 epoxy resin is mixed in a 5:1 ratio with the #205 and #206 hardeners, and a 3:1 ratio with the #207 hardener"
====
That 5/1 ratio is for volume.
For ratio by weight:
Resin weighs 9.6 lb/gallon and 206 catalyst weighs 8.45 lb/gallon
By volume the ratio is 5/1 resin/catalyst, so 1 gallon of resin requires .2 gallons of catalyst.
.2 gallons of catalyst weighs (8.45 x .2) = 1.69 lbs
So the resin/catalyst ratio by weight is: 9.6/1.69, or 5.7/1