Hardening of fiberglass mats involves the process of impregnating the fiberglass mats with a resin (usually polyester or epoxy) and then allowing them to cure. The materials required are: fiberglass mats, resin (polyester or epoxy), curing agent (depending on the type of resin used), mixing container, stirring rod, brush or roller, protective gloves, safety glasses, respirator (recommended).

Steps: Prepare the work area, make sure it is well ventilated, spread plastic sheeting or newspaper to protect surfaces, and wear protective gloves, safety glasses, and a respirator to protect from fumes and chemicals. Next: Prepare the fiberglass mats by cutting them to the desired size with scissors and placing them on a flat surface or on an object to be reinforced. Then mix the resin and hardener. Read the manufacturer's instructions for the correct proportions of resin and hardener and mix the resin and hardener in a mixing container. Mix well with a stirring rod for a few minutes until the mixture is homogeneous and uniform. Apply the resin mixture evenly to the fiberglass mats with a brush or roller, making sure that the mats are completely saturated with resin. The resin can be dabbed into the fiberglass mat with a brush to remove air bubbles and ensure complete saturation.

Then there is the curing of the resin, which is allowed to cure according to the manufacturer's instructions. This can take anywhere from a few hours to a full day, depending on the type of resin and environmental conditions, and the curing process should avoid disturbing the mat. Finally, check the hardness of the fiberglass after curing. The fiberglass mat should be firm and non-sticky to the touch; if necessary, add more layers of fiberglass and resin to increase thickness and strength. After the resin is fully cured, trim excess fiberglass with a sharp knife or scissors.

Other tips: Be sure to follow the specific instructions for the resin and hardener as mixing ratios and curing times will vary, work in a temperature controlled environment whenever possible as extreme temperatures can affect the curing process, dispose of any waste responsibly in accordance with local chemical handling regulations, by following these steps you can efficiently harden your fiberglass mats to create strong and durable composites for the a variety of applications as follows .