I am having problems painting with white enamel. Unlike other paints, this one is hard to use. I always leave brush markings on the model.

How do I paint the model using a white spray can? Do I really need to make recoats for white to be visible?

Air Brush! That will ultimately do the trick. If not - thin it a lot and do multiple coats.

White and flesh are hard colors to use.

Simply put yes. I have never one coated white. Well I tried with a spray can once and ended up with runs and everything and ended up stripping it and starting over. Believe me it's faster and easier just to do a couple of coats in the first place.

Shonen, below is a link to a good short article on using spray paint. Hope this helps.

Spray paint article

One of the easiest way to make white paint stand out is to use white primer instead of grey (or none) before you paint your model. My general approach is aircraft primed white, armour primed grey (unless done in UN scheme).

Oh yes it really helps. Thanks a lot

Lots of good tips here. White and yellow are two of the toughest colors to paint -- they tend to be a bit transparent.

After much trial and error, I have found that white primer in a spray can works best for me (I like Model Master, but I'm sure others work well, too.). It dries flat, so if you need gloss white, you need to spray on a gloss coat or Future. White primer is pretty opaque, so one coat usually does the trick. BTW, when I need to paint something yellow, I first base coat with white primer, then put the yellow on top.

I buy Krylon primer. Ten times the paint for less money, and it works just as well.