S and G is a good product over a wax. I have used the liquid natys blue but never to hide imperfections. It is a fine product as it S and G. They are both slick but IMHO not as slick as BF Polimer spray over BFWD. Problem is, you wont hide swirls with BF products.
Black Hole is a great glaze to hide swirls on dark cars and white diamonds on lighter colors. I have used both on my road to learning how to correct paint. I have all the above products and if you send me 4 small empty bottles and return postage I will give you the samples for each of these 4 products to try for free. Can also give you some BFWD to try if you like.
Sucks to buy stuff you dont love. At least you can try it on a few pannels first. Just PM me and we can exchange info.
i havent used the paste, but i found the liquid to be good. ive only topped it on WG sealant though, but seemed to give nice beading and slickness and extended the life of the sealant.