Here is a set of 1964 Impala Skirts with scuff guard molded in, these will fit the the REVELL 64 kits.
1964 Chevy Impala Resin Skirts-REVELL kit
SKU: SCR 64 REV SKIRTS
As with many resins, you'll need to clean up any excess flash, pin holes and wash down with a good degreaser to remove any oils from the molds. Also before paint, check fitment as resin differs from plastic parts.