SIA sandpaper with hook-and-loop fastener sia 1960, 120. The siafast hook-and-loop system is made from semi-fragile aluminum oxide with a special stearate coating that reduces premature clogging. It is suitable for roughening and sanding paint and lacquer, for sanding solid wood and veneer, for roughening and fine sanding primers, fillers, and compounds, for sanding after moistening the wood surface, as well as for intermediate sanding of paint on flat surfaces and curves.