Comment by mmooss

> What are the allergic affects of the tree, its raw sap, the liquid lacquer, and maybe for hypersenstive/reactive urushiol allergies, the finished lacquer?

Answering my own question, based on reading my own source more carefully (Gladman 2006 p.122):

The Japanese urushi tree, T. verniciflua, is among "plants containing uroshiol cross-reacting chemicals", which are described as follows (note that genus Toxicodendron is in family Anacardiaceae):

"Similar compounds found in other members of the Anacardiaceae family, as well as in several non-Anacardiaceae plants, can lead to cross-reactions and to an identical clinical picture (Table 2). However, dermatitis induced by these cross-reactors is rare compared with the frequency of dermatitis from Toxicodendron species. The allergens in the non-Toxicodendron plants listed in Table 2 are generally noncatechol phenols and resorcinols, and not the highly allergenic catechols in poison ivy, oak, and sumac. The hypothesis that early skin exposure to catechols may allow cross-reaction to other Anacardiaceae, whereas early oral exposure to phenols and resorcinols may induce tolerance, has been expressed."

Regarding the chemical composition, urushiol (in poison ivy/oak/sumac): "is a mixture of 3-n-pentadecylcatechols, which contain a catechol ring moiety substituted with different aliphatic side chains at position 3 or 4."