Can fiberglass be applied after gelcoat has cured?

Yes, fiberglass can be applied after gelcoat has cured, but it requires proper surface preparation to ensure good adhesion. The cured gelcoat should be sanded to create a rough texture, and then cleaned to remove dust and contaminants. Additionally, a suitable bonding agent or resin should be used to ensure a strong bond between the fiberglass and the gelcoat.