First off you used paint that doesn't have enough solids in it to cover in
one coat.

Next you probably spread the paint too thin. (easy to do with cheap paint)

The 1/2 inch nap should be OK, but the time to prime was before the first
coat of finish paint not in-between coats.

In the future avoid Home Depot or the big box stores for your paint
purchases and head directly to the paint store.


--

Roger Shoaf

About the time I had mastered getting the toothpaste back in the tube, then
they come up with this striped stuff.


"For example: John Smith" wrote in message
news:yEeDj.8352$Id3.4294@trnddc07...
I have a medium textured ceiling and it was off-white and I just gone done
painting it with white Behr ceiling paint and a 1/2" roller and I did not
prime, also I mixed the paint really well. It has dried for several hours
now and it looks terrible. I have done plenty of painting in my time but
this was my first ceiling, is it really that different? It is blotchy and
and all I see is lap marks. What did I do wrong? I am obviously going to
re-paint so I am guessing I should prime first and use a bigger roller but
what about the paint, should I use just a flat wall paint? Also, the
texture
has a grain to it, do I paint with or against? Please help, thanks.