Is the Berryman® Chem-Dip® Carburetor and Parts Cleaner, #996, safe to use in an automobile plastic fuel tank to remove 1/4″ to 1/2″ thick varnish? The tank has been removed from vehicle. This particular tank has a swirl baffle on the bottom and a replacement unit is over $1,000. I am considering using Steel Ball Bearings (or BB’s) with #996 to agitate varnish on inside of tank for 30 minutes or so, repeat as necessary, then rinse with kerosene and then rinse with clean gasoline.
The product page indicates that the Berryman #996 cleaner is “Safe on plastic and rubber…”. Yet the actual label on the gallon can reads “Remove all rubber and plastic parts.”
Also would the #901/#905 be a safe product to use in the same manner on plastic fuel tank?
Yes, the #0996 is safe for use on all plastic and rubber components—the warning is purely precautionary. However, the product is water-based, so you’ll need to be vigilant in removing any traces of it. While the #0901/ #0905 is excellent at removing varnish, it is generally too aggressive for use on plastic and rubber components and is strongly disadvised.