As shown in the above figure, there is a problem of adhesive coat cracking at the corner of the Fiberglass mold. After zooming in on the local location, it is as follows:
Through communication with customers, it was learned that FRP molds are used to make fiberglass components for bathroom applications, and there are certain difficulties in demolding each time. Sometimes, demolding can only be done through violent prying and other methods. The obvious reason is that the adhesive layer has cracked and partially delaminated due to excessive force. There are two reasons for the cracking (delamination) of the gel coat: 1. The mold manufacturing process is not rigorous, resulting in poor adhesion of the adhesive layer Based on experience, the white accumulation layer under the damaged gel coat layer in the figure is zero shrinkage Resin. This high filling mold resin will reduce the bonding force with the vinyl gel coat. The optimal solution should be to first create a transition layer between the two - vinyl Polyester Resin. 2. Mismatch or improper use of release agents Most fiberglass mold demolding problems occur at corners or complex structural locations; Due to the high stress, demolding on a flat surface is not a problem, but not necessarily applicable in all positions. Mismatching or improper operation of release agents can also cause cracking and delamination of the gel coat. Based on the actual situation, the suggestions given to customers are: The glass fiber layer at the crack of the gel coat should be lightly polished in a V-shape, filled with high-strength fiber putty, and then repaired with the gel coat, polished and polished. If only the original gel coat is repaired, the gel coat may crack and peel off again due to stress.
