Double Nuts Maintenance
So many times when dealing with tight spots on boats, you can barely reach the hardware your working on or installing. In the picture you can see I am reaching in a hole for a stereo speaker to install a hand rail. I could just touch the bolt with my fingertips. When you finally work a wrench onto a lock nut you have to fight it for the entire length of the bolt because the nylon lock nut never loosens to finger loose.
Now in open spaces I prefer a nylon lock nut because it resists vibrating loose over time, but in some situations as described above I go back to using two regular nuts stacked together instead of one lock nut.
The reason I do this is because you can spin the nuts on one at a time down the length of the bolt with your fingertips. At the very end you have to tighten with a tool. Put one nut on at a time and tighten them separately. The second nut locks down on the first nut and keeps it from vibrating loose. But if you need to remove it later you can separate the two with a wrench and then spin them off with your fingertips.
A side note on the gloves. We wear disposable gloves anytime we have caulk out to prevent the spread of caulk all over other parts of the boat. It finds a way once it is on your fingers.