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Here's a tip for the do-it-yourselfers out there like me who've been struggling, sanding and sanding body putties on cars, or fairing compounds on boats. Get lightweight pre-made body putty or simply add some hollow glass bubbles to your resin. The most cost-effective bubbles I've found are called Sil-Cell. In California, more information about that product is available from American Stone pioneers. To find out more about this stuff click on the link to American Stone Pioneers who carry it.