i dont charge for repairs, i find alot of my customers keep coming back to me because of this, with clients who constantly are using nails i discuss with them what could be causing them to loose the nails, one lady we worked out she was using a hand cream that didnt work with the bio-sculpture gels and she no longer uses it and rarely looses nails!
may be she isnt wearing gloves when cleaning/washing up, may be a body oil causing them to lift, not using acetone free nail polish remover?
even reapplying a top coat every 3-4 days can make all the difference!
if i havnt done the original set of gels i charge around £3 for repair, depending what needs repairing!
a good idea is to put repairs on your price lists, maybe putting "From £?"
then when they come in for a repair state before you start the repair will cost however much
hope this helps x