The proportion of heartwood to sapwood in the main stem does vary with species. Black locust, for example, usually has a very narrow band â often less than an inch â of functioning sapwood, whereas maple stems often can have many inches of sapwood and relatively narrow cores of heartwood.he proportion of heartwood to sapwood in the main stem does vary with species. Black locust, for example, usually has a very narrow band â often less than an inch â of functioning sapwood, whereas maple stems often can have many inches of sapwood and relatively narrow cores of heartwood.
1 Apply stain only at the proper temperature. 2  For most stains, 70 degrees Fahrenheit is the optimum, with the safety range from 50 to 90 degrees Fahrenheit. 3  Stains do vary, so check the label first.o assure the highest quality results when applying exterior wood stain, follow these steps and helpful tips from Sherwin-Williams stain experts. 1  Use the right brush. 2  Use a natural-bristle brush for oil stains and a synthetic-bristle brush for latex stains.
Using them together will actually cancel the benefits of using each of them out. 1  Spray or wipe full strength vinegar on the hard water buildup. 2  Let the vinegar work on the stain for 30 minutes. 3  Sprinkle baking soda on the stain.  Use a green scrubby to scrub away any stain that 1  remains. Rinse thoroughly.