Shurhold Buff Magic Compound & Polish, 64 oz Jar

Shurhold Buff Magic is the compound you reach for when your gelcoat has gone chalky, your stainless has freckled with rust, or your Plexiglas has picked up a season's worth of fine scratches. It's a pink cutting compound that comes in a big 64 ounce jar, enough to work a whole boat and then some. If you've been staring at a dull, oxidized hull wondering whether it's toast, this is usually the first thing we tell people to try before they spend real money on a pro detail.

Here's what it actually does. Buff Magic removes oxidation, gelcoat staining, surface rust, tarnish, Plexiglas scratches, and P800 and finer dual-action scratches. That's a wide range of jobs for one jar. On a fiberglass hull that's lost its shine, it cuts through the dead, oxidized layer and brings the color back. On stainless rails and hardware, it lifts the surface rust and tarnish that shows up after a few months in salt air. And on clear Plexiglas or acrylic, it knocks down the light scratching that fogs up your enclosure panels and hatch lenses.

You can work it by hand, but most folks get faster, more even results with a dual-action polisher. A foam pad is the way to go. Run it around 1200 to 1500 rpm and let the compound do the cutting. Wool pads work too, but they load up fast and tend to sling product everywhere, so foam keeps things cleaner. Keep a spray bottle of water handy. On darker hulls especially, a little water and two or three passes gets you an even finish without streaking, where one dry pass might leave you chasing swirls.

The scratch work is where Buff Magic earns its keep. P800-grit dual-action scratches, the kind you get from aggressive sanding, tend to disappear in a single pass. Anything deeper than that you'll want to wet sand first, then come back with the compound to polish out the sanding marks. Same story on Plexiglas. It'll clear up fine scratches, but wipe the surface clean the moment you're done. Let it dry on clear plastic and you can end up putting light scratches back in, which defeats the purpose.

A word on staining. Exhaust soot and the gray-black streaks that build up around the transom respond really well to a Buff Magic pass. Just be a little careful around any intentionally matte or textured surfaces, because a cutting compound will bring those to a shine too, and that's not always what you want. Test a small spot first if you're not sure.

Surface rust on stainless comes off easily, but understand that the compound removes the rust, it doesn't stop it from coming back. If you've got hardware that keeps freckling, hit it with Buff Magic and then follow up with a metal sealant or polish to keep it clean longer. Same idea on gelcoat. Once you've cut back the oxidation, seal the work in with a wax or polish so the shine lasts through the season instead of chalking over again in a month.

The 64 ounce jar is the big one. On a 30 to 40 foot boat, that's about a full season of use, hull and hardware included, with plenty left for touch-ups. One tip from folks who've been through a few jars: wipe the rim and the lid threads clean before you screw the lid back on. The compound can dry hard in the threads and make the jar tough to reopen next time. Store it somewhere that doesn't cook in the heat, since it can separate if it gets too warm sitting in a hot dock box.

Shurhold's been building marine maintenance gear since 1973 with a clean-and-simple approach, and Buff Magic fits that mold. One jar, a foam pad, and a bit of water covers a lot of restoration work that used to mean three or four different products. It's a good match for the boater who wants to bring back a tired finish without turning the job into a chemistry project.