I removed my rear brake caliper for the first time, and found this white soft-to-the-touch padding on the screws. What is it? It was quite difficult to remove the screws and this must have been the reason. The caliper was mounted with an adapter but there was only a single screw to hold both the caliper and adapter to the frame.
More importantly, can the screws be re-used in their current state, or does this "padding" need to be replaced?
Note: I am not asking about the red and blue threadlocker at the end of the screws, but the white stuff in the middle.
Update: I found an image of this part, showing the same white foam on the screws: https://www.bike-components.de/en/Magura/Disc-Brake-Adapter-for-180-mm-Rotors-p63867/#product-image-6