I have tried many times using straight FO on my skin*, and every single one never smells as good that way as when I have first mixed it with a carrier. I can almost 100% of the time smell something "off" / plasticky / whatever in a straight FO that will be mititgated in a carrier. I don't know why, or if my nose is just wacky, but the result is always better mixed with something else. Also, that oily base makes it stick around longer on your skin. *I've tried several straight FOs just because I wanted to try them, but always when some spills or slips down the side of the bottle I don't let it go to waste. It gets rubbed somewhere on me. Darbla