The CL 567 is a premium aluminium oxide sheet on C/B-weight latex reinforced paper with semi-open coat, for sanding filler, primer, wood, varnish, and lacquer in automotive and finishing applications. Semi-open coat is the considered choice here — when sanding automotive filler, the grain has to stay exposed through the working life of the sheet rather than loading midway through a panel, which is exactly what closed coat alternatives do on softer, resinous substrates.