Thanks Chris
You will need two Drums for 100sqm.
If you have never applied it before you will end up putting to much on ...that or even worse too little!
You will not get a feel for spread rates till you have done a few an you get used to your sprayer and walking speed.
If you go ahead ....measure out a square meter and apply to that area your selected amount.Do it again and again ...that way you wont have any nasty surprises at the 50m mark!
Don't use a matt finish ...use gloss and call it an "enhanced" look...bringing out the natural features of your customers beautiful drive.Most customers don't know what they want an it is really up to you to give them the best "look" for there money.(although most specify they do not want a shiny driveway)
Gloss will never be shiny on something like UV bleached rough finish block driveway.
Don,t seal if there is movement driveway.
Don't seal without leaving the driveway to dry out for 2/3 days in "hot" sun.
Don't seal if weeds are present before cleaning (without treating first...you need a licence to do this).
Don't seal if there are depressions in the driveway with no way of draining.
Don't seal if there is any "loose" sand lying on the block.
Double check shaded areas for moisture in the block.
Be Careful about using a PU sealer if it is your first sealing job.