Just to close out this discussion, I ended up purchasing some PVC Pipe Cleaner at Home Depot. A small can (8 oz) was only about $4. It consists of a mix of Methy Ethyl Ketone and Acetone. I needed it to work on the ABS plastic cowl, but didn't want a full quart. Works great to thin the 30 minute epoxy. Allowing to cure overnight gives a very nice hard finish.

Brad