Thanks Hal, that is one of my "hmm, I wonder"s, the fixative aspect, esp b/c I do a lot of my work in sketchbooks I make (or rather am starting to use the OPs in there).
To me it would stand to reason, these being essentially sticks of pigment with an oil type binder there will not be a problem, I have used RF's sticks for awhile now for under painting sketches etc (which are remarkably similar to Senneliers in their lipstick like consistency....)
All in all, it will come down to just trying it, as it usually does. Am not one for following the dogma of a medium, but do believe in "knowing the rules in order to break them"...
Anything I discover, I will pass along...
Just occurred to me to check Creevy's book (the oil one is Bible like in my studio, just got the pastel one) to see what he may have to say on the topic...must dig it out today.
And my thanks for the Welcome, too!
Am really enjoying the medium!