385 Carr Drive
Brookville, OH 45309
www.fibreglast.com
1.800.821.3283
PDCT-PI-00008-A-10/07-RR
385 Carr Drive
Brookville, OH 45309
www.fibreglast.com
1.800.821.3283
1/4 Pint
Touch Up Spray Gun
123-A
Usage Instructions & Parts List
GEL COAT TROUBLESHOOTING GUIDE, continued
6. Discoloration On Finished Parts: This problem is caused from porosity
related to air entrapment while spraying. This can be overcome by spraying
the mold surface with several light passes. It is also important to bleed any
moisture from the air lines and to be sure that the mold surface is dry.
7. Craters And Pock Marks: These surface blemishes can be caused by
improper resin to catalyst ratios and improper air pressure both high and low.
Another cause for craters would be oil or moisture on the surface of the mold.
8. Fisheyes: Fisheyes are usually caused by contaminates on the mold like
dirt, moisture or oils. Bleeding the air lines and using air filters will lower any
air related contaminates. Try to isolate the spray area from any oils, especially
silicones.
9. Blisters When Immersed In Water: Blisters can be caused for the following reasons:
1.
Incomplete cure
2.
Improper wetting of the back up fibers
3.
Bad bond between the gel coat and the back up laminate. This is
often caused by contamination.
4.
Thin gel coat
10. Lifting Of Gel Coat Before Laminating: This condition is usually related to
shrinkage of the gel coat. Shrinkage can be caused by:
1.
Too fast of a curing time normally caused by over- catalyzation.
2.
Delays between the gel coat and laminating can cause shrinking
3.
Variations in gel coat thickness can vary the gel time which can cause shrinkage.
4.
The mold surface is too hot.
11. Back Up Pattern Showing Through Gel Coat: This visual pattern is caused
by too low a gel coat thickness or the gel coat was not properly cured.
12. Gel Coat Sticking To The Part: This condition is caused by improper
releasing of the mold surface. It is important to use release agents formulated
for the reinforced plastics industry. Proper training and common sense will
eliminate most of the problems associated with gel coats. Proper handling of
gel coats will result in a part with a blemish free surface.
