Do a test on a hidden area before covering the whole drawer front or table top. The underside of a drawer, the inside edge of a removable panel, or some other inconspicuous place is the best spot to see how your furniture responds to stain or paint. Here’s why: Color on a label or color card is just a guide. The color of the wood, leftover finish, sanding, filler, or whatever was previously done can make a big difference.
Think of the hidden area as a smaller model of your real project. Clean, sand, wipe off the dust, and prepare the hidden spot as you’d prepare the exposed spot. Then put on a thin coat using the same method or tool you plan to use later on the real thing. If you don’t treat the hidden spot the same way as the exposed one, it won’t be much help to you.
Stain will show up problems early. Coarse sanding marks may look darker, filler may absorb stain differently, and unfinished spots may grab stain unevenly. With paint, you’ll see if uncleaned spots accept less paint, if brush marks are more prominent, or if the color that looks good in the jar looks worse on the furniture. A small test gives you a chance to see how those things affect the larger area before you apply them there.
Wait until the surface has dried to the point you expect it to dry before evaluating the test. Wet stain usually looks darker than it does when it’s dry, while paint can change its sheen as it dries. If you’re planning more than one coat, test them as well. Doing a couple of thin coats as samples can also help you evaluate how much pressure to use on your brush or rag, and whether the coating is going to run or get gummy.
When your furniture has had a repair, doing a test can be especially helpful. Fill, bare wood, veneer, and spots where some of the original finish remains might not all respond the same way. You might discover that a repaired nick gets much more apparent after applying stain. In that case, you can choose a different color, adjust the repair, or think of another solution before applying stain to the whole piece. Trying to conceal a bright spot after you’ve covered the rest of the piece would be much more difficult.
It’s not important that you create a flawless square on a hidden part. It’s important to know whether your color choice is appropriate, whether your preparation is sufficient, how your coating spreads, and whether an issue arises with the finish’s sheen. After your test patch performs predictably and you know why it didn’t perform perfectly, applying the finish to the rest of the piece can be done knowingly instead of blindly.
