I'm building a basic ledge.. cinder blocks, construction adhesive, angle iron. Don't want to fuck with mixing with concrete or anything. Just wondering if there is a 1/4" material I can put on top to flush the coping? I know it will be be fine without... but a flush top would still be nice. Someone posted a long time ago about using decking material but everything I've found in home depot is 1" thick and my angle is 1/4". Should I just say fuck it? Or is there something I can stick ontop that will fit and slide nicely?