You know what they say about Kansans... When the sirens go off, we don't go to a shelter, we go to the porch.
Actually, this was the first time since I was a kid, that I was actually in the basement bathroom with my family, all the cash and valuables, blakets, water, etc. It was a close call for sure. Thanks for all the happy thoughts.
As for the fiberglass, I tested a small section with alcohol because I just happen to have a large bottle on the work bench. I also found a plastic dish scrubber thing resembling a steel wool pad, but... plastic. I grabbed an old retired t-shirt from my shop rag bin and started working.
I generously flooded the surface with alcohol and scrubbed hard everywhere there was epoxy. I quickly followed with the t-shirt before the alcohol could evaporate. It worked very well. The oily feeling surface was dry and hard.
Then, before reading Roberta's sage advice, I hit it with a random orbit palm sander with a very worn 50grit disc on it. I did not press--just kinda let it scuff itself with gravity. Again, it worked great. I didn't cut up the weave at all. I also feathered all my edges well.
I gave it all another wipe down with an alcohol soaked rag and managed to get one side done today.
I'll do the other side in coming days as time permits and then re-feather and clean as before, because it seemed to have worked well. Then, it's just a matter of filling the weave.
For the record, I get a genuine blush in 2 1/2 hours. My build coats will go on every hour or even less when I start them. Temps are normal, even a bit cool--wierd. Either way, the epoxy is easy to work and hard as a rock after 3 hours.