Merely coating wood or timber with coal tar or other tar, he finds of but little advantage. Moll's British patent was granted in 1836, and is the more interesting, as his process is based on the ...

Because it takes a little longer that can compound any delays." Lowis says Surface Coatings came close to running out of coal tar so ended up blending it with asphalt-based sealer for a period of ...

As sealcoating contractors begin their season many of them, particularly those accustomed to using refined coal tar sealer, wonder what the season will hold for their favorite product. Already ...