Karen
Stainproof has been alcohol based for some time now as the Marble Porcelain sealer changed to acetone base. I have never had a call of failure yet in 5 yrs.
I have resolved the problem of the darkening effects from Stainproof by bleaching twice and using Methylene Chloride in some areas.
The area 960 sq. ft. of exterior limestone in which I applied 2 1/2 gal of Stainproof to.
I returned the remaining of the 12 gal. and have tested another batch lot with no ill effects.
Drytreat has offered to send me two cases free of charge.
I hope other applicators don't have a major problem as I did. Very fruststating!
So far Drytreat has not admitted any fault of the product yet, just replacement and free sealer.

I hope you Know about SK 40 and it's problem turning surfaces white if applied in the sun where cloud covered or not?

If you have any questions, you can call me. 479-903-1412.

David Bassler

Hi David,
I purchased several cases of Stain Proof late last year and have been phasing it out of our projects. I don't know if the formulation changed or not, but ever since they switched to the new Acetone based product (which caused the problems you are describing) and then going back to the so called "original" formula I haven't been thrilled with the performance. We have had much better luck with STT SB and FE. We also have some of our own formulations that our perform (stain protection wise), I'm just unsure how long the protection lasts. Do you know if the 12 gallons you purchased were the acetone based (voc exempt) or the original alcohol based formula? We over apply stain proof on every job... it's part of their recommended application rate on the label. We have never darkened any stone with the formulation that we have used. The label recommends one quart per 20 to 250 sq ft depending on surface absorption. How many sq ft per gallon did you use? They recommend that you generously saturate the surface with Stain Proof. Did you wipe off the excess before it dried? The label does say it can lighten or darken some surfaces, but we really have never experienced it, only hear about it.
Keep me posted on what comes of this. I heard a blow torch is needed to remove it.

Karen
I have a major problem with Drytreat Stainproof that thought you might be aware of. The last batch of 12 gallons purchased 3 weeks ago have caused all stone and grout that I tested to darken. I found this out last week after applying to 1,000 sq ft of exterior limestone. I am work to resolve the color enhancing effects of this application.
Have you experianced this? If so, have you remedied this? Would you like to keep you posted?
I have a couple of chemicals that I tested this weekend that I will be trying tomorrow.
I've all ready passed communications to Stuart Anderson of Drytreat with me to blame for excessive application.
Even polished granite will darken, as well as any absorbant stone.
Please let me know your thoughts on this matter as my customer and architect are thinking of not letting me finish the remaining 5,000 sq ft pending the out come.

David Bassler 479-903-1412