dear bhai jan
turtle ice polish is synthetic wax so good in protections well if u increase ur budget than meguiars nxt paste wax is very good choice , not only good in protection but also produce beautiful clear looks and good reflections
by light cutting means , compounding than polishing than synthetic wax coat
compounding, polishing not a every day products so instead of investing in compounds and polishing u can get this done from any professional and just maintain the work with weekly shampoo wash and wax
however if u wish to do it urself than meguiars ultimate compound and ultimate polish is good combo however electric polishers brings best outcomes instead of manual applications
yes turtle ice shampoo is good and safe for paint