Hi Derek,
Here speaks a man who has gone back ot portables.
The decision was based largely on factors other than opperating efficiency.
I have a large established customer base, supplimented by referals, but mainly repeat business, so my market is predictable.
I also have a transit van which is packed to the gills with what I consider essential equipment/chemicals so the T/M was in a trailer
Into this scenario comes the fact that many of my clients live in pedestrian precicts where the nearest parking is 200ft or more away and you get the situation that the portable was a more practical option and the trailer made parking more difficult or impossible. It was therefore left at home.
The amount of time the T/M was standing idle increased when I decided that the unsociable hours and payment delays associated with working for a brewery were unacceptable.
I have never regretted not not worrying about the safety of the T/M, people tripping over hoses crossing public footpaths and other sundry little niggles.
As to time saved by useing a T/M - on some jobs un-noticeable, on others negligible.
Quality of work and drying times are not issues since tecnique can largely compensate for inherent differences.
This is not a condemnation of T/Ms, indeed if I were just starting in this business rather than 'accidentaly' drifting into it as an offshute to designing/ building machines back in the 60's, then I would probably buy a T/M and build a suitable market.
Old dogs can learn new tricks but some of us learn which tricks to forget
John.