the boots don't see high temps. They are on the outside. Much cooler than inside where the slide pins sit.
Also, the lithium grease is too thin. Most will run out and there's no 'residual' like you have with thick grease.

 

Thanks for all the advice- I am going to try this out in the next couple weeks.

 

This is what I use on brake components...
https://www.permatex.com/products/lu...s-lubricant-2/

 

here is what For/Motorcraft lists as a lube for the caliper slide pins.

https://www.fcsdchemicalsandlubrican...nce%20Products

 

Yeah that’s what I use. Says so right in manual.