I did, they didn't have what I needed at the time. They closed down several years ago. There's Tap Plastics in Lynnwood that I would go to now since they carry several weights of glass cloth, CF in different forms as well as plastic sheets and several shapes.
I don't build with balsa, other that airplanes. If it gets wet, it swells up like a sponge. I build my boats from aircraft grade birch ply, birch boards and spruce stick stock.