How to Make a Fiberglass Hood

Written by jay kurz
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How to Make a Fiberglass Hood
Custom fibreglass hood (HorsepowerandHeels/Flickr.com)

Making a fibreglass hood is a two-step process. The first step involves building a mould out of the identical hood you want to make. The mould is made with the same materials as the actual hood will be made from. After you have the mould completed, the second step is applying fibreglass mat and resin to the mould to produce the hood replica. If the mould is made correctly, you can get many uses out of one mould.

Skill level:
Moderately Challenging

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Things you need

  • Original hood
  • Boat wax
  • Scissors
  • Tooling gelcoat
  • Gelcoat spray gun
  • Air compressor
  • Air hose
  • Fibreglass mat
  • Polyester resin
  • Hardener
  • Small buckets
  • Stir sticks
  • Felt rollers
  • Air roller
  • Paint scraper
  • Rags
  • 800-grit wet sandpaper
  • Respirator

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Instructions

  1. 1

    Find the same model hood that you want to make. Put two coats of boat wax on the top side of the hood. Buff out using a clean rag.

  2. 2

    Place the fibreglass mat over the hood and cut the mat so it has a 2-inch overhang on all four sides. To make the mould strong, use eight to 10 layers of the standard 425gr mat.

  3. 3

    Make sure all the dust is off the surface of the hood (use a clean rag).

  4. 4

    Mix the gelcoat with the catalyst as directed on the containers. Pour the gelcoat into the gravity feed spray gun. Gelcoat is thicker than normal car paint so you have to make sure the gun sprays gelcoat. Spray the first coat making sure it covers the entire surface. Let stand for 15 minutes or until its tacky. Repeat for all three coats. Let cure.

  5. 5

    Mix the resin solution with the catalyst as directed. Wet out the surface of the gelcoat with the resin mixture using the felt roller. Add one layer of mat and wet out thoroughly. Make sure there are no dry spots. Go over the entire layer using your air roller, getting all wrinkles and air bubbles out. Let cure for one to two hours or until hard and cool to the touch.

  6. 6

    Wearing your respirator prepare the hood for the remaining layers of mat by sanding the surface with sandpaper.

  7. 7

    Make another bucket of the resin mixture. Using the same process as in step 5, add the remaining layers of mat. Let cure.

  8. 8

    Remove the fibreglass mould from the hood using a paint scraper.

  9. 9

    Prepare the mould by wet sanding the gel coat with 800-grit sand paper. Make sure all defects in the surface are sanded smooth, or they will show up in all the mould layups. When the surface is smooth, add two to three layers of wax.

  10. 10

    Mix a bucket of resin and catalyst. Using the same process as step 5, add two layers of mat onto the mould and let cure. Once the first two layers are cured, sand smooth and add the remaining layers as you did in the previous steps.

  11. 11

    Using the paint scraper break the hood free from the mould. Wearing a respirator, cut and grind to the dimensions of the original hood.

Tips and warnings

  • Always wear safety glasses and respirators when working with fibreglass materials.

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