Director Ambekar E. Eknath, Ph. D Head, APED J.K. Jena, Ph. D ...

Step - 4: Wax the Mould
After the mould is properly sealed, hard paste wax is appl~ed on it hvice. A
good automobile wax, one that contains Carnauba, IS desirable. Polishing
should be done on the mould as to an auto body, using a clean soft cloth.
Step - 5: Apply Mould Release
Mould release (PVA) is to be applied over the paste wax to make the
separation of mould and product quite easy. The separation should be at the
wax line, but if the mould release is not present, the heat of cure may destroy
the wax. Water-soluble film forming of paste type mould release may be used
as mould releasing agent and applied with brusheslsponge. It will dry after 3-
4 hours of application and form a thin plastic film, which can be removed with
water.
Step - 6: Apply Get Coat of Resin
Mix the gel resin first with the colour pigments (10%) and then 1-2%
accelerator (Cobalt naphthanate) is added to this mixture. Then add 2%
catalyst (MEK) peroxide to it and mix again. Brush the resin mix in a thick
coat on the mould surface. Allow it to cure. The first coat should be as thick
as possible without severe drainage. It makes a nice surface with polish.
These gel coats are allowed to cure before any other materials are added to
the laminate. Sand the cured gel coat or rough lightly with steel wool before
the next coat is applied to prevent the delamination.
Step - 7: Appllcation of Resin
The resin is mixed with the normal amount of accelerator and catalyst, and
applied over the cured get coat. This resin coat will hold the glass material in
place, and also help to keep out air bubbles.
Step - 8: Apply First Layer of Glass Material
Cut chopped stand mat (300 g/m2) to the shape of the product (allow enough
on all sides to grasp the material and pull out the wrinkles) and lay it over the
mould, which has just been covered with resin. Lay it down from one side to
prevent air from being trapped in it.
Step- 9: Additional Glass Material Layers
Additional layers of material (300 glmZ or 450 glm2) either chopped stand
mat or woven moving placed over the mould in the same manner as the first
ones. This layer may be of different kind of material than the first. Greater