Another alternative that I find works well is to
mix micro with West Systems Epoxy instead of the regular construction
epoxy. The West is apparently less viscous and will accept more micro thus
making it lighter and easier to sand. And it's available with slow and
fast cure hardener. There's no compatibility question with the rest of the
airframe adhesives and you still have the option to mix it as wet or dry as the
application requires. It's available with in-can pumps so mixing is
easy. And it's usually available from marine dealers so if there's one
nearby you don't have to pay shipping. Just another idea to
consider.
Leighton Mangels
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