We had our log home corn cob blasted last fall. Then a Perma-Chink sealant was applied followed by 2 coats of Perma-Chink Autumn Gold Stain and 2 coats of Pema-chink gloss. We also had he entire house sealed with Energy Seal. The problem is the house has a very mottled look color-wise with very dark areas interspersed with lighter areas. Is this normal?