How can I make my own chamois cream? I am about to ride a 300km brevet, and the plan is to let the faster bike alone at home, and go with a heavier one, for a lot of reasons, and one of them is the riding position on the fast one makes friction against the saddle a long-term problem. Besides, it is fixed gear and since I cannot stop pedalling, the problem is even bigger.

I have seen people talk about the wonders of chamois creams and powders, and I am planning to use some. But since I tend to have a traditional approach (and to be very skeptical about fancy advertisements), perhaps using some traditional home-made solutions could become an interesting exercise in self-sufficiency.

Some folks told me from experience that corn starch makes an excelent sweat-absorber, and also helps the skin to not suffer from friction.

Some folks told me from experience that solid vaseline might be useful, too.

How can I make my own chamois cream?
Most of your chamois creams/"butt butters", such as Paceline's "Chamois Butt`r", are fairly conventional combos of standard skin cream ingredients, with a heavy emphasis on lanolin.

I've never tried petrolatum (though many swear by it), and I'm a bit skeptical as to how it would fare compared to the more skin-cream-like concoctions.  Plus it would make more of a mess of the chamois and be harder to launder out.

I'll admit that the commercial concoctions are a bit expensive, but a little goes a long way, so it's not that big of an investment.