I saw some fiberglass repair kits, boat maintenance stores should have them. You might also look into those and if starts to get bad you might want to put a stop to it right away.
Delamination is a killer for fiberglass walled RV's, and as far as I know, short of a wall change, there is no stopping it once it spreads.
I was going to install scare lights on my SV-291, but the factory folks said not to do it, quoting delamination issues if I messed up insulating them against water properly.
2009 Ford F-150 XLT/XTR 5.4l, CrewCab. long bed
2011 Surveyor SV-291