Can I use self-levelling compound over old carpet adhesive? I've ripped up the current carpets and found a couple of strips of very old carpet glue that are proving a NIGHTMARE to remove from the concrete. Do I have to? I'm going to use a primer, and then go about 4mm with the self leveller, and then put floating floorboards over the top of that. My real question is if the old glue will mess with the levelling compound in any way and cause me problems later. And if I do try remove, what should I use?
Yes but I personally wouldn’t. I had the situation as you and I chose to remove the glue as it might have contained asbestos. I suggest you rent a floor scarifier which will properly and effortless remove any protuberance - ask the supplier for an accessory for removing glue. For me (amateur), it took a day to remove the complete old leveling compound up to the concrete for 50sqm.
If you do elect not to do that, make sure you liberally use a quality primer before laying the mass