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Nicer models can even switch between grinding, sanding, and polishing so you can finish the whole job with just one tool.
Unlike with the other methods, it's important to use grinders and sanders evenly across the whole floor. Instead of focusing on one area, you should travel evenly around the room as to not grind down one area further than others. Mistakes like that are costly. You can smooth off the mastic with saliva on your finger, the more saliva the better but make sure you don’t put your finger in your mouth as the silicone may be harmful if swallowed.
Methods of Mastic Removal
A mastic sealant comes handy when sealing your windows, waterproofing your bathroom among other uses. However, the sealant can become ineffective due to old age, which is why it has to be changed from time to time. Removing old mastic sealant might seem an easy DIY task, but you can end up damaging the shower, sink or bathtub you are trying to reseal. This is why such work should be left to professional mastic sealant contractors. On the other hand, versatile models can switch from grinding to sanding and polishing, which will leave your concrete looking new. If all else fails, it might be time to bring out commercial-grade tools. Instead of melting away the glue, you can grind it away from the concrete. Spending hours kneeling on a floor and manually scraping is certainly not the least taxing way to remove mastic. Professionals arm themselves with commercial-grade tools that save their joints and make jobs go faster.
If you’ve never used a mastic gun before, go and practice somewhere else, perhaps under the sink in your kitchen or under the stairs, anywhere where it’s hidden from view. The only way to get a professional finish with silicone is to use this kit, forget 'wetted' fingers, masking tape and all the other rubbish that people have told you, this kit, if used correctly, will give a finish that only professional can obtain, without the mess which is normally associated with silicone.Regular cleaning agents won't make a dent in dried mastic. You'll need to resort to more commercial-grade solutions. Walk-behind concrete floor grinders will help you do the job standing up rather than all your knees all day. They'll also wield considerably more power than hand-held models. The only thing that I would caution against is using the saw tooth tool to remove old silicone because if, like me, you are not in complete control of it you can scratch other surfaces very easily. I resorted to using a sharp wood chisel to remove the rest of the old silicone. Not all hand-held grinders can handle the tough job of bringing up mastic. They also are not as durable and might not last as long as bigger and more powerful models. You can improve upon this method even more by pouring the boiling water onto a towel that's been laid on the floor. The towel will keep the water in one spot and retain the heat so that the mastic has more exposure.
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