T-Cut is very good. I was in the trade.T-Cut is the actual name on the bottle.There are two types, one for metallic paint and one for solid colours. Apply it on a clean soft cloth and only use it on one small area at a time (about a 12inch square).Rub it in the square, then with another soft cloth polish it up.Keep on doing the squares,overlapping the edges of the previous square.This way the result is even all over with no smearing, and even in the sun you can get it looking good. Dont try short cuts by doing too big an area, you will take twice as long and not look as good.The nature of these products is to dry and go powdery, but small patches is the secret.(I use T-Cut, not what you mentioned. You can buy it at most auto shops).