The Krew Comb had some fumes so I've switched (for now) to a tube of Burt's. It holds just about as well and so far so good, but it too has an odd herbal-ish fragrance that takes getting used to having it jammed right up under the schnozz.
I imagine beeswax with an oil mixed in. In a tin, heat it over a stove. Then apply CAREFULLY. Probably could hold face over wood stove momentarily to melt wax.
I have been using my wax on the middle of the stache, and yours on the tips. As long as I don't over apply the wax, I can do this without a blow dryer and the mockery from my wife that comes with it. I add a little more wax at work if it starts to sag. Need about another month for the hair in the middle of my lip to reach the ends of my mouth, and that should make it easier.
Thanks to John @Screwtape for a tub of lavender wax. I've trimmed and begun taming my no style Walrus (left) towards a Gunslinger type (right).
IIRC the old 1970s movie version of The Murder on the Orient Express showed Poirot readying himself for bed and using 1930s period equipment to maintain his waxed moustache. ISTR he had a little candle burner set to melt beeswax in and to heat a little set of tongs to curl the moustache (sort of like those old-time hair curlers). When he slept, he put the 'stache tips in a mini face mask to keep them from getting crumpled by the pillow, and probably to keep the wax off the bedclothes.