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Step
1:
Sand the substrate or the existing surface with 40 to 80 grit
sandpaper using an orbital sander or by hand. When resurfacing
a mold or part, the surface need not be completely removed
to the substrate. It should, however, be free of any glossy
areas. Dry sanding is recommended.
Step
2: Check for any cracks or chips penetrating through the
surface into the substrate. If present, they must be repaired
immediately, as any laminate defects will eventually transfer
to the surface.
Step
3: Repair all surface cracks, chips or gouges with a repair
paste. Mix only the amount of repair paste that can be used
within 15-20 minutes. Add 15 drops of MEKP peroxide catalyst
to one ounce (30 grams) of repair paste. Mix thoroughly by
stirring and folding. Apply with a spatula, putty knife or
squeegee. Fill the void completely by working the paste in
all directions.
To
repair large areas with a repair paste, slightly mound the
paste to ensure a complete fill after curing. Since this is
a polyester material, add a colored gel coat if a color is
desired. Large voids may be reinforced by adding milled glass
fibers or other similar reinforcement to the paste.
Since
repair paste shrinks very slightly, the application of heat
to the repaired area will insure that all shrinkage has occurred.
Use a heat lamp or a hair drier for "post curing"
this material. Be careful not to over-heat the area surrounding
the patch.
Step
4: Wipe the entire surface clean to remove dust or other
contaminants.
Remember:
This procedure is only for repairing the surface of an existing
mold that is to be resurfaced. Now we are ready for the primer.
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