How to Make Fiberglass Planters

Written by tanya khan
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Fibreglass is durable, long-lasting and lightweight, making it a suitable choice for garden pots and planters. To make a fibreglass planter, you need a metal mould or an actual planter in your desired size around which you can lay the mats. The material is left to harden so it takes the shape and size of the mould, thus forming an exact copy. Fibreglass is available in marine or auto parts stores and is easy to work with. Use fibreglass planters to dress up a balcony, terrace or spot where weight is a consideration.

Skill level:
Moderate

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Things you need

  • Planter mould
  • Cloth
  • 2-by-4 lumber
  • Saw
  • Hot-glue gun and glue sticks
  • Mold wax
  • Tape measure
  • Fibreglass mat
  • Knife
  • Bucket
  • Fibreglass resin
  • Catalyst
  • Felt and air rollers
  • Sandpaper
  • Metal scraper

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Instructions

  1. 1

    Wipe the inner and outer surface of the desired mould or planter with a cloth and leave to dry. Smooth out any bumps on the outer surface of the mould to give it an even finish. Cut 2-by-4 lumber to four 6-inch lengths using a saw.

  2. 2

    Glue a 6-inch length to each inner corner of the desired mould or planter using a hot-glue gun and glue sticks. The lengths of wood serve as legs that lift the mould off the ground so the outer surface is easily accessible.

  3. 3

    Apply two to three coats of mould wax over the outer walls of the mould using a foam applicator and leave it to dry. Use a clean rag to wipe away excess wax from the mould.

  4. 4

    Measure the length and width of the base and outer walls of the mould and cut fibreglass mat to size using a razor knife. Using the cut mats as a guide for the remaining three layers, cut more mats so you cover the outer walls of the mould four times.

  5. 5

    Follow label directions for mixing the resin and catalyst in a small bucket. Run a felt roller covered with resin over the outer walls of the mould to wet them. Apply the first layer of mats over the wet surface and completely saturate these with the prepared resin mixture using a roller. Make sure the seams at the edges do not overlap and trim the excess with a razor knife before saturating.

  6. 6

    Run an air roller over the surface gently to flatten the mat and remove trapped air bubbles to give the planter wall an even finish. Repeat the procedure for applying each layer of mat over the previous layer and saturating it completely with resin until you lay all four layers. Leave the fibreglass in a cool, shaded spot for four to six hours or until dry.

  7. 7

    Rub the surface of the dried fibreglass using 100-grit sandpaper gently to remove rough spots and give the walls and base an even and smooth finish. Also sand the edges at the opening of the mould.

  8. 8

    Slide a metal scraper between the mould and fibreglass and run it between the surfaces to loosen the fibreglass. Insert your free hand inside the mould and lightly tap the inner base of the mould to release the fibreglass. Slide the fibreglass out of the mould.

Tips and warnings

  • Wear gardening gloves and a face mask when mixing the resin and catalyst.

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