Hello Gas1.
If you think that the problem you are faced with is so bad that you need to put in FX2 (which is the best 'hard' cleaner around) then, personally, I would prepare the customer for the worst possible outcome and be prepared for more work.
That's just my opinion of course. We've had a few microbore jobs that on the surface looked straightfoward and turned out to be a pig. Out of many successful ones.
To protect yourself in a court of law I would imagine that you must read Kamcos instructions and follow them - just in case. However, I would be happy to leave it in my system (Vaillant boiler, 15mm copper pipes and steel rads) overnight. And add neutraliser after the clean
I have no aluminium and lots of time, water and neutraliser for my own system.
GAs1, do you refuse to powerflush 8mm unless you can clean out the rads outside first? Does anyone else?
I wouldn't worry about putting a hole in a rad with a vibrating pad. Has anyone actually put a hole in any kind of rad using a vibrating pad? The first time I used one a badly installed 15mm pipe popped out of a lockshield but blasting a hole in a rad with one?
I for one would love to hear about it. There are a few myths around that get in the way of the truth about powerflushing. People need to know if that is happening and why.
Gas1, please forgive the soapbox and all the best whatever you decide to do.
Regards
Ian Pritchard