Repairing Black/Ebony Polyester

Watch the video Polyester Repair for Ebony for a tutorial on the basics of ebony repair. Polyester Lacquer comes in 3 sizes; 100ml, Pint and Quart. Polyester Lacquer Hardener is sold separately and comes in 2 sizes; 10gr (for 100ml) and 50gr (for pint and quart). For case and surface damage, we recommend using Konig’s Rex Lith gel filler. Rex Lith kits are complete and come with 120gr Gel, 10gr Hardener, Blending Spatula and Clear Plastic Fill Sheet.

Intensive Black is a concentrated dye made especially for high gloss polyester ebony finishes, which matches most non-Asian pianos. For Asian pianos, the color can be adjusted by adding Asian Black pigment. We also carry Black w/Brown Hue, Black w/Green Hue, and Black w/Blue Hue pigments for pianos & furniture that require these respective tints. All black Pigments must be mixed with Intensive Black Dye when being added to polyester lacquer.

Thin Finish Repair: One of the most frustrating things that can happen during a finish repair is sanding through a thin finish. In the past, it required building up the finish with repair material, allowing it to cure, and going through the whole process again – risking another sand-through.

Acrylic Ebony to the rescue! We had this topcoat formulated as a much simpler solution. It is shipped with reducer, hardener, and complete instructions. Contact Allied Piano for more information and ordering at 215-491-3045 -or-

Here are the critical points:

The surface must be level and sanded prior to application. An air-brush will give you such a good result you may not need to sand and polish, as it dries to high gloss. Otherwise, apply with whatever tools you have available. Acrylic is not as hard as polyester, so less aggressive treatment will be needed. I begin with 1000 wet/dry paper, use one paste compound, then polish.

If sanding will be required, spray or brush on three coats, and allow 2-3 days of curing time to allow for shrinkage.

A bonus use of this product is for filling in and hiding small imperfections in a repair, saving you the time and effort of opening the site back up and re-filling. These little spots can normally be completed all in one trip.