I'm sure about the meaning, but I'm not sure if there is a more specific term for this.

see:
... for the emergent Barrow industries of shipbuilding and heavy industry.5 Close .... Copal is the dried and crystalline resin from any one of four or five ...
www.jrsm.org/cgi/content/full/97/12/599
The invention relates to the impregnation of wood by a solvent-free melt of ... dammar, copal, acaroides, rosin, wood resins and tree resins, such as, ...
www.freepatentsonline.com/6596063.html - 42k

Consider potential allergic reactions, Transparent wood impregnation with ... safflower-stand oil, walnut oil, dammar, shellac, copal resin, beeswax, ...
www.auro.de/EN/product_search/product.php?mysearchvalue=&my... - 29k