I used my materials sampler to try out a range of finishes. I'm very impressed by the DecoArt range, which is available in generous sample sizes from Amazon. I bought the "DecoArt DASK282 Americana Finishes Sample Pack", which has a range of different gloss, satin and glittery finishes as well as a triple-thick gel coat.
The image below shows the result of applying sealer, then metallic red paint (from the "DecoArt DASK268 Dazzling Metallics Sample Pack"), followed by 3 layers of triple-thick gloss glaze (2 would have been OK, but I got some streaks in it so I sanded it down and put on another layer). The painted part feels completely smooth to the touch, the glaze completely removes the surface texture.
Even though that's a lot of coats, it didn't take very long because this stuff dries really quickly.
The kit seems to be great value as well, the "sample" pots are 2 fl oz / 60ml each. For the price of one (too big) tin of varnish from the hardware store, there are 5 different finishes to try out.