How to paint white staircase trim handrail which are currently painted black?

there is a pasta called Paint stripper. use the paint brush and spread it everywhere and after with a scrapper remove all the black paint. after a light sand by hand with sand paper 120-150 grade and is ready to be re-coated. good luck!!!

Hi. I understand you not wanting to sand black painted trim. You can however prime it first without sanding using a 'super grip' primer. Dulux crown etc have versions of this. I prefer to use the zinnser range of primers. If you google 'zinnser guide to preperation' you will find their products applicable to your job. One thing i would suggest though is that you ensure all surfaces are thoroughly clean first. E.g a good wash down with sugar soap followed by clean water and allowed to dry.