Posted By Thomas Marino on 08 Jul 2010 08:36 AM
I have a restaurant job that we finished in October that had some existing Uba Tuba granite bar tops that wre to stay in place. There are two old field joints that looked 'ugly' and the GC just filled them with clear silicone. We have now been asked to repair these seams as the bar patrons have dug out all the silicone with forks etc and now the seams look even worse.
My initial thought wa to clean out the seams and use Intega adhesive to fill the joint level and make a somewhat 'patron proof' repair.
Am I on the right track with my thoughts??
Is Integra the best product to use??
What is the best method to remove the old silicone in the joints??
Tom in PA
I just did this job:
There are four nasty silicone joints, three are visible. Your repair depends on the thickness of the joints. I was able to get my thin-blade Japanese saw between these. You want to remove as much silicone and contamination as possible, then flood the joints with your solvent of choice, I perfer acetone.
I double taped each side of the joint so you can screed off excess without worrying about too much shrinkage. Push the adhesive into the joints with a razorblade. When the methylmethacrylate sets up, peel the tape and scrape the joint with a perpendicular razorblade. Resist the urge to cut the excess, you'll pull adhesive from the joint.
If the joints are fat, you'll probably get some air bubbles and the methylmecraylate will be too thick to fill them. Use some super glue and hit it with excellerator. I'd tape again; that excellerator can cause a "bloom" which can be a huge pain to remove from certain granites.
If the joints are tight, you may have to use a water-thin acrylic. I've heard of guys sucking it through the seam with a vacuum, but I haven't tried that yet.
That stuff requires a two hour cure time; bid accordingly.
Scrape the super glue with the perpendicular razorblade and polish with some of Dani's Granite Polish or similar product to get the seam shine to match the top. This may have to be repeated, depending on the fussiness of you or your clients.
The seams could now be top polished, but that takes practice before you do it for pay. Uba Tuba is kinda tricky from what I've been told, but the seams will rival those of solid surface and no one will be digging them out with a fork.
The pictured front sink rail rocked before I redid the joints. It doesn't budge now. Sorry, the "after" pics didn't turn out.