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4 To help reduce noise in hard to reach places, DEI also supplied us with its Boom Mat spray-on (PN 050220, $10.67). Since it would be difficult to place the regular Boom Mat into the fender well, we choose to use the spray-on. We also sprayed any area that we felt may be crucial to any rust in the future. We let the material dry for about an hour while we took a lunch break.