Methyl Ethyl Ketone Peroxide (MEKP)

MEKP is a clear hardener/catalyst for the room temperature cure of unsaturated polyester and vinyl ester resins. It is also needed with all gel coats. It is typically used between 1.25% to 1.75% (1 2/3 ounce to 2 1/3 ounces per gallon). Resins that have Duratec in their name require a 2% mix ratio (2 2/3 ounces per gallon).
MEKP is hazardous.  It needs to be handled with care.  We sell catalyst dispensers to help you carefully add/measure the amount of MEKP you need.
Below are some charts to help you figure out how much MEKP will be needed for the project. Keep in mind that it is best to mix in small quantities.  Large quantities will exotherm and kick off very fast, leaving you with a smoldering mess in your cup.

Catalyst Quantity Charts

CATALYST LARGE QUANTITY CHART

Catalyst Concentration
Resin Quantity
Quart
Gallon
5 Gallon
1/2%

1/16 oz

2/3 oz
3 1/3 oz
3/4%
1/4 oz
1 oz
5 oz
1%
1/3 oz
1 1/3 oz
6 2/3 oz
1 1/2%
1/2 oz
2 oz
10 oz

CATALYST SMALL QUANTITY CHART

Catalyst
Concentration

Resin Quantity
30 drops = 1 cc

2 oz
4 oz
8 oz
12 oz
16 oz
1/2 %

9 drops

18 drops
36 drops
1.8 cc
2.5 cc
3/4 %
14 drops
27 drops
2 cc
3 cc
4 cc
1 %
18 drops
36 drops
2.5 cc
3.75 cc
5 cc
1 1/2 %
27 drops
2 cc
4 cc
6 cc
8 cc
2 %
36 drops
2.5 cc
5 cc
7.5 cc
10 cc

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