Since you're replacing it and those are plastic nuts you could just cut them off and remove the faucet. I've seen people use silicon that way but even after it hardens years later it's not that hard to remove. If that is some sort of epoxy you may have to Dremel or grind it off to get a good seal on the new faucet if it spilled over to the bottom of the sink. I'm guessing it shouldn't be that much trouble though.
sarxsvt t1_jdtrmv7 wrote
Reply to Replacing kitchen faucet and there’s this weird substance under mounting nuts. What do I do? by warsquiat
Since you're replacing it and those are plastic nuts you could just cut them off and remove the faucet. I've seen people use silicon that way but even after it hardens years later it's not that hard to remove. If that is some sort of epoxy you may have to Dremel or grind it off to get a good seal on the new faucet if it spilled over to the bottom of the sink. I'm guessing it shouldn't be that much trouble though.