with regard to the bonding, coast air pays the rating and if you dont leave you dont pay anything. if you do leave you pay 1/36th for every month you leave before your 3 year contract for bonding is up.
with regards to the per diem. You work 17.14 days a month (12/9) schedule and you spend an avarage of 4 nights a month at your homebase (HAU) where we have a hoteldeal for 300 kroner a night. those nights you dont get tax free per diem. but if you dont live in HAU you can deduct hotel plus food at the end of the year. so you get the money back at the end, if you are away from base you get your hotel payed. almost no pilots live at the homebase
In coastair you also get after 6 months staff travel with SAS and Finnair so you can travel to greece in your free periode of 9 days for about 1500 kroner. there is also a taks deduction for traveling home from your work at 1.5 kroner a Km but im sure that doesn't work all the way to greece
if you work extra in the 9 free days they pay you extra aprox 2000 NOK a day. so you can earn extra by selling som free days
All in all it is not the best payed job in the world but for a commuter job it is quite OK.
Did you talk to them already couse they might need some more pilots in the future since norwegian needs 60 pilots so some pilots might leave