Hello
There is a Antisteinschlagmasse ( Gravel protection depending on year PVC or Bitumen based ), the Antidröhnmasse ( Sounddeadening ) und die Feindichtmasse ( finesealing ).
Teroson ( Dow Corning/Henkel ), Sika Chemie, Würth, Scholl or Berner have the things in there catalouge.
Only the finesealer needs a speical application tool.
Ask your painter about the usable combination as some things will buble up the new paint generation.
Grüsse
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