I wouldn't price it by area. Do it by time.
If its 500m2 of open area that needs stripped there will be a lot less detail than somewhere that has shelving in. You might also be able to use a scrubber dryer rather than a rotary and wet vac.
It may also be a textured wood effect trapping more soil/finish than a stone effect.
Amtico products are johnsons rebranded. So Carefree Speedstrip and Johnsons Eternum or Satin will be the equivalent. I usually find that on a refurb people dont care so much about which product is used so go with which generic product suits you/your supplier etc.
In my opinion it doesnt make any difference anyway.
A handy item to have along would be 400 grit honing powder for scratches or areas scuffed by hard plastic racking feet. A quick dusting of this under your normal cleaning pad will save hands and kneew work with a scourer.
