When restoring a vertical surface drill holes in a downward angle and then saturate with PC-Petrifier . If needed, apply more PC-Petrifier to affected area. Normally one treatment will be sufficient. After area is restored, fill holes and missing wood with PC-Woody Epoxy. Best results are obtained when applying at temperatures above 45 F to dry wood.
Successful application depends on the woods' dryness, porosity and preparation.
PC-Petrifier can be used to prepare old wood for priming and painting. Well in excess of two years.