Well the last time I used pink bodyfiller, it was a fibreglass-based filler and was waterproof.
The grey is probably primer; in my admittedly limited experience the is no such thing as grey bodyfiller. White and pink, but not grey
Proud TQE Operator and President of SEFAG - the Society for the Elimination of Ford Automatic Gearboxes
Pacemaker headers + 2.5" exhaust
EF Fairmont interior
Lowered King springs
5 speed manual
Newest mod: EF Ghia wiring loom and dash