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.
According to most deck stain manufacturers, the air temperature should be no lower than 45 degrees while being applied. This is only an average. Some deck stains need to be applied when the temperature is at least 60 degrees.Check the label on the deck stain you are using. In addition, once the stain is applied the temperature should not drop below freezing for 8-12 hours.This can otherwise hinder the curing process of the stain. Penetrating stains will not cure properly while film forming deck stainâs adhesion will be jeopardized.n addition, once the stain is applied the temperature should not drop below freezing for 8-12 hours. This can otherwise hinder the curing process of the stain. Penetrating stains will not cure properly while film forming deck stainâs adhesion will be jeopardized.