Howdy, which one is better to skim with? To glue with? Fill and so on I figure the wood flour is more fiberuss, therefore being stronger in itself but does it stick to your work surface any better then the cell o fill? I thought about mixing the two I'm sure I'm overthinking. I'm working on a semi flat 8'x20' barge like hull, so lots of thicken epoxy work to be done. Curious about what the higher level builders think. Jim
Hi Tornado,
for skimming (also known as faring) a hull, none of these aditives are appropriate. if you are simply faring and smoothing a hull you would use micro-balloons and make a bondo-like paste. clc has it at this link: https://clcboats.com/shop/products/boat-building-supplies-epoxy-fiberglass-plywood/phenolic-micro-balloons.html
woodflour is great for filletting and bonding. cell-of-fill is mostly for glueing and bonding. both of them would be extremely tough and difficult to sand.
hope that helps,
h