This is followed by a light coat of PVA film either sprayed or brushed on. Allow to dry overnight before applying the gel coat. The gel coat is the first step in making the actual mould. The gel coat should be tacky but not wet before proceeding. Gel Coat Troubleshooting Application of the gel coat is perhaps, the most difficult aspect of manufacturing in fibreglass.
Problems arise due to temperature variation, catalysing and a variety of handling techniques.
The following list should help resolve some of the difficulties. A wrinkle can also occur if the gel coat is not cured enough prior to lay-up. Before lay-up check the surface for tack. The surface should be sticky but not transfer to your finger. If the gel coat contains pinholes, check the spray equipment for moisture in the air lines or dirt in the traps.