Mixture: 2% TO 3% of local hardener to the total amount of resin.
A general purpose, semi flexible polyester resin used primarily with fiberglass reinforcements. …
It is also used for fiberglass cladding for strong structural repairs on wood, metal or fiberglass.
When mixed with fillers, it can be used for filling cracks, gaps and fractures.

Advantages:
– Fiberglass last long
– It can be colored, shiny or dull
– It is low maintenance
– Anti-magnetic
– Fire resistant
– Good electrical insulator
– Weatherproof
– Low Cost

Disadvantage:
– Strong odor
– toxic of its fumes
– Airborne fibers can caused asthma

Safety tips:
– wear mask to minimize the amount of fumes you are inhaling and any particles during sanding.
– wear safety gloves when applying random strand mat at mixtures.
– work in a well ventilated area.
– properly storing of materials after used.
– proper housekeeping.