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Old 12-30-2007, 03:24 AM  
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Default Decor & Paint

I have a hollow, concrete block fireplace which I want to paint to look
like french limestone. To do so I must fill in some, not all, of the grooves which are 3/8" wide and deep. I want the finished surface to be smooth but still look like stone. Questions I have are:
1. What is the best material to use to fill in the grooves? How do I prevent shrinkage?
2. Do the brick have to be sealed? With what?
3. What is best type of plaster to use for creating the finished semi-smooth
4. Should I anticipate any problems using oil-based paint on the surface?

Thanks for your thoughts.

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Old 12-30-2007, 08:07 PM  
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Welcome Portland:
I would use a mortar mix from the big box store. Mix it a little dry (so it crumbles in your hand), sprinkle an area of the blocks and apply the mortar with a wood float or steel trowell. You will need to sprinkle it again after a bit (maybe 1/2 hour) and rub it with a (just damp) sponge trowel which will press the mortar into the joints and help it to keep from cracking. Repeat the sponge trowell two more times.
This will leave you with a semi smooth (or sandy) surface ready for bolck primer. Then you can use any kind of paint on that surface.
Please let us know how it turns out. Maybe some before and after pictures.

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Old 01-13-2008, 11:29 AM  
Daryl in Nanoose
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Please let us know how it turns out. Maybe some before and after pictures.

I to would like to see some before and afters.
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Old 04-24-2008, 10:37 AM  
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I would be interested in the pics as well.
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