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A: We don't recommend it on soft metals like brass, copper or gold plating. Most older silverplate is okay, but we recommend that you try to polish the piece in an inconspicuous spot to test. DO NOT use Peek, or any polish, on any plated item unless the manufacturer specifically recommends it. Peek is not dangerous to use on any metal, but the actual polishing is what rubs the plating off.Chrome plating is different and quite thick. Peek is recommended on Chrome.

A: Peek cream or foam will work great on most plastics. It will remove oxidation, graffiti, stains and minor scuffs from Plexiglas, Lucite, Acrylics, Vinyl windows and many other plastics. Some plastics are too soft or are made of various materials that Peek does not work on. We recommend that you test Peek in a small, hidden area to be sure.

A: Yes, both the cream and the foam work great with a buffer. We do recommend that you use the buffer at 1000 RPM or lower. Peek will work fast, and you want to prevent burning of the surface.

A: Using a magnet, you can tell whether an item is solid brass or copper. Brass and copper are not magnetic, so the magnet will not stick. If the magnet sticks, then there is another base metal underneath. Silver pieces usually have a stamp on them indicating whether they are silverplated or not. Solid gold usually is stamped with the karat value of the solid gold. Many times you can just make an educated guess based on the amount you paid for the item.