I have a kalis tang that appear to be fixed with Tien Ta Yao Gin
at least the odor and color matched
. It appear to be used to lacquer the cord on the hilt as well. It is easy to find in Java but not sure about south PI. I heard gondorukem were used on keris but never find evidence, nice woody scent when heated. It is hard and bound to wooden surface alright (cord also I guess) but I would say somewhat brittle. Need to check how it bound to iron.