I know the difference between clear and blue bottles. You can mix the two just fine. As confirmed by the CREATORS.
Matt - how is it complicated.

You take 10mil of blue. 90mil of clear. Mix it together. I don't sit of an evening measuring out 9mil and 1mil each time.
i think my van has 15 brushes on it.
Trailing a new brush from a supplier now and TBH if it lasts I will just use that one. One with fans. One with pencils. Simples.