I see a lot of post with people adding paste of whatever color to their leather strop.
Personally I don’t think I can bring myself to put paste on a fine English Bridle Strop. I’ve been a straight shaver continuously since 1995 and on and off from 83’ to 95.
My Father in Law and his Father we’re both Barbers and neither of them ever heard of putting paste or anything else on leather.
I do use a fabric weave strop that I treat with CRX. I use a Crayon to apply it.
I also have a hard will felt strop that I spray with either Crx spray or .025 diamond spray.
I don’t use dressing on my leather strop. I just rub it with my palms good every few days. Maybe once a year I’ll had a few drops of Neatsfoot oil and rub it in with my Palms.
I only use the fabric with Crx when the edge feels like it might need a slight tune up. When it does I will do about 6 strokes on the fabric wipe the blade with tissue then strop 50 times on the leather and shave. If the edge still needs work I go the 12K Naniwa and dobten laps followed by ten strokes on Fabric with CRX the 50 strokes on leather and this almost always does the trick. My razors are HHT Sharp. I test the edge on at least 4 different places on the edge with a single hanging hair. I keep working on the razor until it possess this test.
Everyone has their own routine. Mine is one that has evolved through the years always subject to change.