Question for Tonercote Bath Resurfacing (NZ) Ltd

Hi ! in otahuhu , its just a common old steel/ cast iron ?? bath , but i would like it spruced up . it is stained etc. could you please let me know if you can do this in situ . also how soon , + approx cost. could you also let me know if you cannot do it, so that i can try elsewhere. have a magic day . joe.