Rated 3.4 out of 5 by 38
Rated 5.0 out of 5.0 by Newiess Massive Mastic Mess and the magic Remover that worked great!
We had a massive amount of the old cutback/mastic adhesive to remove from our concrete slab floor throughout the living room dining room and hallway.. used to glue down old wood floors 50plus years ago and it was thick everywhere. This remover we poured it on used a metal scrub brush to to rough it up and let it sit for 2 to 6 to 12 hours depending on just how thick it was and how tired we were of scrapping and scrubbing and it was like magic it removed everything a little effort was put out but not nearly what we were doing with other removers. Its a bit messy we had that black tar slurry in lakes and puddles and it was so thick in places I never thought we would get rid of it but a little cat sand or other type of absorbent clay/sand poured on the slurry then stirred until it was not a liquid anymore...all we had to do after that was scooping and dumping! we were finished in no time. It works and it works great it was not instant for us but I believe had an unusually large amount of that stuff on our floors. Hate Cut Back LOVE LOVE this remover! OH and no real odor to the product or at least not one we could smell over the old mastic smell ick!
October 20, 2016
Rated 5.0 out of 5.0 by Backbreaker911 Removes Black Mastic (old adhesive)
This was for 100 sqft room
I poured the product on, directly to the surface. Staying within a 2x2 area.
I waited 20 mins, used my scraper to take off the bulk of the adhesive, collecting it with paper towels (Bounty 8 rolls).
In the same 2x2 area, I used the 747 Sentinel in an old Windex bottle and gave a light coat. Then used an old dish brush to work the product into the concrete.
Using paper towels to wipe it off.
Afterwards, when this black tar mess was wiped up. I went over the concrete with driveway/concrete cleaner and a hand brush.
Advice: Use paper towels to collect the mess. Dont wear clothing that you care about. Kitchen gloves are your friends. Its not toxic, just messy.
June 29, 2016
Rated 4.0 out of 5.0 by Stepper Great product
I had to remove some black mastic of the concrete floor worked great poured it on used a brush to SCRUBB it a bit left on for 30 minutes used a Sqezie cat litter to absorb and Palmolive dish washing liquid to mop up it was a rap.
September 10, 2016
Rated 5.0 out of 5.0 by Johnny Great Stuff!! Removing Vinyl adheisive
This stuff is great! I use this for removing automotive vinyl sticker adheisive. I've used several gallons now and have no complaints at all. After transfering it to a spray bottle it will spray in either a fine mist of stream, with its slight light oil consistancy it doesn't evaporate quickly but will evaporate leaving little to no residue, although it does have a smell, it's not overwhelming. After removing the vinyl just spray it on, let it sit for a few minutes and either use a plastic scraper or stiff plastic brush then a terry cloth rag and the paint is ready with no scratches. This has taken a whole day job for me and turned it into a two hour job.
May 4, 2016
Rated 1.0 out of 5.0 by paul did not work for vct/carpet glue
label says removes vct and carpet glue. Not one bit. Goof off worked much better.
July 13, 2016
Rated 4.0 out of 5.0 by HappyDIYerInDiego Works as advertised on early 1960s black mastic. Seems to be safer than any other method I have tried.
My 1964 home originally had 9x9" vinyl tiles glued to the concrete floor with black mastic a.k.a. "cutback" adhesive, with cheap carpet on top of that. I am getting rid of the original flooring and putting down hard tile.
I rented from my local Home Depot a "Diamarush" and a floor buffing machine to remove the mastic from one room. That worked well but created large amounts of dust that is nasty and may also contain asbestos.
I have also tried Jasco Paint & Epoxy remover which contains volatile organics. It's highly toxic and difficult to use because it turns the mastic into a tarry goo that is hard to lift off the floor and dries quickly back to a hard mass. I decided that (by itself) would not be an economical solution to my problem.
Sentinel Formula 747 works as advertised. FOLLOW THE INSTRUCTIONS and don't expect it to work on adhesives other than what the manufacturer specifies.
I haven't yet tried the recommended Sentinel Formula 810 for final clean-up, but the Jasco Paint & Epoxy Remover worked very well on my test patch. So did denatured alcohol.
Removing black mastic is a horrible, nasty job even with the best tools available. The Sentinel 747 product seems to be the most painless and least hazardous way to get the bulk of it off of concrete.
June 5, 2016
Rated 5.0 out of 5.0 by MarreroGirl !OMG! Buy this stuff IT WORKS!!
I'm in Marrero, La.(mom)..I peeled up my ORIGINAL 1970's tile and found a BLACK GLUE...I was like wha'da' HECK. So I looked around, tried GOOF OFF..!BAD MOVE! Read that this (Yellow Bottle) stuff will LIQUIFY THE BLACK CUTBACK GLUE..I was like...okay, I'll try it...!OMG! It did just what it said. I poured it on the floor, spread it with a broom, waited 30minutes...took my LARGE WINDOW SQUREEGY (that's all I had at the time) and YES!! I was so excited it was working I teared up. I'm gonna try to post pictures.KEEP IN MIND, ITS A GLUE REMOVER, so once you remove the BLACK GLUE and you discover TILE BACKING..that's a whole nother issue..but THIS STUFF will take up the BLACK GLUE.
March 1, 2016
Rated 4.0 out of 5.0 by GED Pretty Good. Would use it again
I have a 1960 house. The black mastic underneath the 10x10 squares needed removed.
After a couple attempts with the product I found this to be the easiest way to use it.
Tape plastic anywhere you want to protect.
Have an area to change your shoes and such to keep from tracking anywhere outside the project area.
Tools - 747, Big Squeegee (I used one meant for driveway sealant), metal dust pan, kitty litter. Broom- or brush, Mop, Dawn Dishwashing detergent, bucket., Wet/Dry Vac.
apply material liberally. Brush it evenly on the floor. I brushed back and forth and in a circular pattern. Let it sit for several hours (I waited four or more). I scrubbed one more time with the broom. Then used the squeegee to form puddles and apply kitty litter. Put that in a waste bucket. Bush any other areas that are stubborn or use a scraper. Continue to collect the material in puddles and remove with the kitty litter. Very quickly after this, apply the bucket of water and dawn solution with the mop and swirl it libberly. Vacuum the water with the shop vac. I used a dehumidifier to aid the drying process. The last step is to rinse again with plain water.
May 24, 2016