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Oct 08, 2009, 01:42 PM
Composites Kid
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How to make Cheap "Bondo"


1) Get some cheap polyester resin, and make sure it has already got cobalt in it by pouring a bit on a piece of wood and mixing in a drop of MEKP catalyst.

If it cures, then it's got cobalt pre-mixed in it. If it doesn't, you need to either get cobalt and mix it in to the right proportion, or get pre-cobalted resin.

2) Get talcum powder. Not baby powder, get real talcum powder as a filler. This can be found in composite supply stores, and sold by the 1/2 or complete gallon.

Measure out 1/16 gallon of polyester resin. Mix it with talcum until you have a homogenous mix that has the consistency of Bondo.

Whenever you want to use it, just scoop some out with your putty knife, mix with a drop of MEKP per teaspoon of putty, mix well, and apply!

NOTE: Please test your putty before actually using it on anything significant. By testing, you can get accustomed to the working time, or find a putty/MEKP ratio that suits you better

-Alex
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