I mixed the rondo at 1 to 1, and it worked just fine. The set up time depends on how much hardener you use, and if you add any heat to the equation. I used a lot, so mine set up fairly quickly, not so fast you couldn't work with it, but enough so that you weren't held up by waiting for cure times. I used a blow dryer to speed up the process once I had it all in so that it would eliminate a lot of the smell. As far as sturdy, its rock solid. I mean, I would break my hand punching it before it broke. The only draw back is that it is heavy. I could have gone with one layer of mudglassing, but I did two to be safe. Next time, I would only do one layer and wouldn't resin the inside first, but that's me. Did a bunch more bondo work today, the top is pretty much done. Bought the professional grade bondo, and its a MILLION times better. It is smoother, and it sands a ton easier. I will never use the other stuff ever again. It was worth the extra two dollars a quart, hands down. I took some pictures, but they don't show much of a difference, and the lighting isn't great. I will do a bunch more tomorrow and post pics then for the 'pics or it didn't happen' nazis. There are a lot of little details and what not missed in the pep file, and some things that aren't quite accurate, but they are almost easier to do with bondo. Almost. Y'all will see once I am done.