Saw on youtube some guy spray silicone foam on his window riser rubber guides (where the glass rides against when you raise or lower the glass) and claim this keeps the window action smooth. Good idea or bad?
I do it to every car I own or work on, yes it works and really gives the motor and mechanism a break. I use the stuff from 3M now (used dielectric before) so I can also use it on brake parts.
Apply it down the channels with a long wooden Q tip.
A very popular grease for rubber/window tracks..etc is Honda's Shin-Etsu which is silicon based. But this is the paste/gel not the spray. The spray may work for rubbing it on trim but you'd want something thicker for the tracks.
I used a Q-tip on a coat hanger to do my Miatas window tracks when I had it.
" ... Silicone-based lubricants also show excellent compatibility [with synthetic rubbers and plastics]. They are suitable for low load applications and a wide temperature range (typically -90 to 425 F) ..."
yup, used the pb blaster silicon spray lube for the window tracks on my vic and it worked well. before, i thought i needed new motor/regulators on both front doors which is a pain in the you know what. here we are a few months later and i think i need to re-apply.