I found a gal of UCL for $27 at AAP. Would the FP60 squeeze bottle work for UCL? Can the plastic withstand UCL and would the remaining FP60 react negatively with UCL?
Jonny, here's my advice- look on the bottom of each container. All my FP jugs & squeeze bottle have the /2\ symbol on them. If the Lucas jug also has the /2\, then yes you can use the FP bottle for the Lucas UCL.
Mixing UCL & FP? Now *that* I don't know about.
If you're talking about whatever trace of FP remains after you empty it, I wouldn't worry about that. If you mean mixing them 50-50 or something similar, I'd seek further info first.