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.
There are several factors that effect the reapplication of wood stain. The type of wood, if it's a close grained / pored hard wood and you're using a spirit based stain, give it about 10 min's between coats to allow the stain to sink in and the spirits to evaporate. Reapply the next coat doing the same etc Solvent stains are much the same. Soft wood or ply types can be re coated in about 1 minute but don't apply too much stain at a time. It also depends how you apply the stain, either a paint brush or a wad of lint free cotton type material so don't apply too much as above.