It went well with the dope. As you stated Yvan, LTS50 is thin and you have to prevent it during drying from dripping down. Best way doing this would be a rotating device on which the driver would rest. So I knicked some of my son's Knex. It is supposed to be black, but it clearly has a dark grey color. I had hoped it would cover all the light specks, but unfortunately it didn't. It also dries satin (disclaimer: at least when applied to a layer of dope).
I decided to use sandpaper (grain 2000) to even the cone and hopefully sand away some of the specks and spots. To my surprise I found that the LTS50 still was fully soluble which made me decide to use an acrylic resin dispersion as a fully waterproof (as well as a glossy) cover over the LTS50 which I had to apply again.
After sanding, to get rid of the light specks, I used a black Edding 300 marker making the cone fully black again. After that I applied two coats of LTS50. Finished it off with two coats of acrylic resin dispersion (white when applied, dries transparent) and hey presto! So long dirty sticky drivers!