Black slates in most cases arent very porous. The enhancer only sits on the surface so the residue needs to be buffed off completely. Surface should feel  dry to the touch or as close as possible.
What product did you use?.It is possible you can use mineral sprits or acetone to thin it out and remove the excess.
Read the label or msds to see what is in the product then we can give you some tips on removal.
If the customer is saying it is still sticky then depending on the time you applied it the product may not have cured yet. Bring rags and try to remove it with some acetone. If you suceed at removing it you can possibly try a different product or use the same product only less and remove it better.
Use something thin. If time is a problem try miracle one step color enhancer from home depot. It is not the greatest but you will be able to complete the job and the residue is easy to buff off.
When you apply it you only need a small amount -less is better in this case. 

On Fri, Mar 18, 2011 at 8:50 PM, Baird Standish <bairdstandish@gmail.com> wrote:
This kind of thing happened twice to us recently on a honed travertine floor.  The first time we successfully took off the sticky residue with an 800 grit (yellow i believe) twister pad dry.  We reapplied some impregnating sealer, overdid it a little, but were able to take it off with two passes with different hogs hair pads dry.  Not saying that stripper will not work or is not necessary, but we were lucky that we found we didn't need to go to strippers and it still worked out fine.  Might want to test this.
Baird


On Fri, Mar 18, 2011 at 9:41 PM, steve cox <pcox@homesc.com> wrote:
Thanks for info.  So applying more of the color enhancer sealer will help remove the sealer that didn't absorb, and then just power clean and try a topical sealer instead of impregnating sealer after several days of drying?  Haven't used a topical sealer, what do you recommend?

Steve
Cox Stone and Tile Care

On Fri, Mar 18, 2011 at 9:25 PM, <info@restoreyourtiles.com> wrote:
I had this happened to me but with water based color enhancer sealer. The floor was a Jefferson slate which apparently has lots of oil inside of it. That is what prevented sealer to get absorbed into the stone. I used more of an enhancer to dissolve the sealer and wiped off entire floor with rugs. Then I used Klenzall from Stone Tech and my truck mount to clean the floor. After drying floor for 2 days I applied topical solvent based sealer and came out very nice.
Adam Bartos
BiO Tile

Sent via BlackBerry from T-Mobile

From: steve cox <pcox@homesc.com>
Date: Fri, 18 Mar 2011 20:03:58 -0400
To: Restoration and Maintenance<sccpartners@stoneandtilepros.com>
ReplyTo: "Restoration and Maintenance" <sccpartners@stoneandtilepros.com>
Subject: [sccpartners] Sticky Slate After Color Enhancing Sealer

Received call from the homeowner stating the floor seems sticky 24 hours after application of the sealer.  Put a light coat of color enhancing solvent based impregnating sealer on black slate after 2 days of stripping acrylic wax.  We used black pads and bare bones stripper to finally get off the wax.  Going back in the AM, any suggestions if sealer still sticky?

Steve

Cox Stone and Tile Care

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Facility Specialists, LLC
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Phone: 215-732-7505
Fax: 215-546-9160

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