Recently I've noticed that may pro slingshot makers are using the TRU-OIL, a product used for conservation and finishing gunstocks, mostly. I wanted to try it, but it is difficult to obtain it here.... Found one little bottle of 90 ml for about 30 dollars. Analizing the composition, we can see mineral and vegetal oils mixed with mineral and vegetal solvents..... There is a very tradional and an ancient product in Brazil, used for conservation of wooden furniture also being used to seal the wood. It exists since 1938.... I'm testing it on some pieces with amazing results! I'm buying the tru-oil and the lineseed to make comparation.... If anyone of the builders here want to test and colaborate with my little analizis, I'll be happy to send a bottle.(if the law allows that..... I need to check this on the mail...) Volunteers?