I always coat the umderwrap first.
Just slice the bumps off with a sharp razor blade, wrap your guides on and apply you next coat. No Scotch or Scotch-Brite
Shouldn't be a issue, but you can always call bullards and ask
Know Before You GoLocal Weather | Marine Bouy Weather | Inshore Forecast | Offshore Forecast | Interactive Wind Charts | Tide Charts | Sea Surface Temps | Chlorophyll Concentrates | Online Chart Viewer