I need to touch up some epoxy primer on a wingtip bow. We're talking maybe 10 square inches of surface. I'd like to use my airbrush on this. The question is how to accurately measure the small quantities of the two liquids? A pipette is probably the way to go, but I don't have one. I do have accurate scales, but the epoxy manufacturer (This is the Poly-fiber epoxy primer) doesn't list a "by weight" ratio. Presumably, I could measure out a substantial quantity (6 liquid ounces, say) and weigh those samples to develop a "by weight" ratio to use for small quantities. Any better ideas?