Getting the right texture...
You should lay down a bonding primer so all you come up with has something nice to adhere to as you go forward.
My guess is sand and lots of coats of paint. You might try the bags of polystyrene pellets texture at the paint store too. They offer more texture with less weight than sand or gravel. Experimenting to match is the key. Make sure you work in small batches and not the original paint can. Make notes of your formula so you can replicate it. Stir often to suspend the texture.
You might try mixing the texture in thinned drywall texture to bulk it up. Then prime and paint over it.
I am afraid there is not magic formula for this.
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Last edited by sdsester; 06-14-2012 at 07:33 AM.