2021 Conchfish 17.8
Never used the brown microballoons, but the Q cells work well. They are easier to sand than the pre-mix stuff, and go on smoothly. I think straight Q cell won't be as strong, though. I made my own mix with Q cells and silica when I ran out of the US Composites stuff, and it seemed pretty similar. It actually might be worth starting another thread on different fillers and when you use what, since these questions seem to come up pretty often during people's builds. There are many folks on here that have more experience playing with different fillers.