 Kauri gum was used commercially in varnish , and can be considered a type of copal ( the name given to resin used in such a way ) . Kauri gum was found to be particularly good for this , and from the mid @-@ 1840s was exported to London and America . Tentative exports had begun a few years earlier , however , for use in marine glue and as fire @-@ <unk> ; gum had even made up part of an export cargo to Australia in 1814 . 
