From the inside:

• Sand the area around the hole. Remove any dust and clean the surface using acetone.
• Cut out 4 pieces of chopped strand mat that overlap the hole by about 2″ (50 mm) all the way round.
• Wet them out using resin mixed with catalyst (this makes the resin go hard).
• Place them over the hole layer by layer. Make sure the edges are pressed down well.
• Leave to harden.
• Sand down any rough edges to leave it smooth.

From the outside:

• Mix gel coat with the colour pigment & catalyst.
• Fill the hole making sure there are no air bubbles trapped in the gel coat.
• Fill above the level of the surface.
• Leave to harden.
• Smooth down using wet & dry sand paper.

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