My old random orbital sander died so I purchased a new one. I got a Ryobi sander. It vibrates so much my hands get sore in minutes and even worse, its dust collection container doesn't hold the dust. Has anyone else had problems with these sanders?

I have sanded my hull, but now have no wood flour for filler (there is lots on my walls, floor, shelves, etc., though). I have a few small gaps on the outside of the hull that I would like to fill between the white cedar strips. I seem to remember someone suggesting baking flour or corn starch or something similar. Any suggestions?

John