Thanks guys
Will check on insurance.  Also, I think that there is both water staining in the stone and etching (can feel the grooves made by water damage).  
I like the idea of honing dry, but then would be foregoing chemical cleaning ?  I have never used screens (except on a wood floor) what would this entail?  Here are a few more pix of what the walls look like.  the last picture in the group is what the results of my efforts were on one spot along the edge.  Still some tiger striping but a smooth finish and a much more even look.
Baird



On Aug 5, 2009, at 9:07 PM, Dr Fred wrote:

This can be a bit tricking and I agree you should try to stay away from any chemical. You may want to try honing dry with screens. If this works it will be a little dusty but you wont have the over spray problem. If you use any thing with water you take the chance of the stone re oxidizing and turning brown again.

On Wed, Aug 5, 2009 at 7:05 PM, Baird Standish <bairdstandish@gmail.com> wrote:
Hi Everyone,
We have a contract to clean and hone the limestone framing around the entry and windows at a church.  The Limestone has been damaged by water.  What this means and what I see is fine (and not so fine) etching from water, ingained white efflourescence, discoloration of the limestone itself (from iron oxide perhaps?) and general soot.  They were unhappy with a "skimcoat"  test-painted on - (probably R-97 by Cathedral Stone Products).  Also, someone else tested Prosoco 942 and that didn't work either.  I tested honing a portion of the wall with 400 grit Twister/velocity pads on a hand-held and using NCL Hurricane natural stone cleaner.  It came out looking pretty good and gave it a nice smooth surface. My three questions are:
1. Any other cleaners that I might try?  I have some Klenztone Limestone cleaner that might do the trick.  I think I want to stay away from acidic solution.
2. We are going to be working up high on heavy duty scaffolding.  I want to work out a way that chemicals and water don't spray all over the place and that the solution can be collected in some fashion.  The windows will be cleaned professionally after we are done.  We will put plastic, paper and tape around.
3. I am pondering getting a variable speed angle grinder with a water feed (maybe the Alpha variable speed polisher), but wondering if it is worth it.
We haven't spent much time working up high on walls.  So any suggestions would be great.  Thanks,
Baird




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