Super Polyester Filling (Super Poly Fill)

FGCI Polyester Filler

Our Polyester Filler, Super Poly Fill,  is designed with high quality materials composite finishes in mind. Best for above the water line structural fixes like center consoles hatches, decking, boxes and more! Comes with the required MEK 925 catalyst.


*For Drum Quantities – please contact us via our Contact Us page.



OEM Polyester Filling


FGCI’s OEM Polyester Filling, Super Poly Fill does it all. From tooling, to fiberglass repair, fairing, fitting to just fixing the ding in your boat, OEM Super Poly Fill does it all. We designed Super Poly Fill with high grade ingredients to dry crack free, even in larger masses. Due to our proprietary formula, vertical surfaces are no problem for OEM Super Poly Fill. OEM Super Poly Fill uses MEK-P to cure and is recommended to mix between 1%-2% by volume, depending on temperature and mass.

Catalyst Concentration Chart - Resins and Gelcoat

Note: The most important step when it comes to getting a good bond is proper surface prep. Proper surface prep could include sanding or abrading; grease cleaner; steam cleaning; acetone wash or polyester primer. 


Step 1: Ensure the surface is clean and dry. 

Step 2: Mix 1.5%-2% MEK-P by volume. See the Catalyst Chart for amounts. Fold the MEK-P into the putty with a putty knife and mix for 3 minutes. 

Step 3: Apply the putty to the surface, leaving it a little higher than the surface and ensure the putty is applied all the way into any scratch or gouge. 

Step 4: Allow to dry for 12 hours before treating the surface and 24 hours for a full cure. 

Step 5: Sand the surface flat. 



  1. Charlie Norris

    “I love fiberglass coatings. They have great products and excellent advice. I'm trying to open a boat repair shop in St . Mary's, GA and my supply WILL come from fiberglass coatings. When I lived in the Fl. Keys for 36 years and worked for a towing and salvage Co for 15 years all our supplies came from Fiberglass coatings. Great service and never were disappointed. Keep up the great job everyone.”
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    “The staff are very knowledgeable and friendly Have always gotten the right stuff for the right job. Pat,mark,Colby,Ryan your the best. Pat is the walking encyclopedia of FGCI.”
  3. Justin Lammers

    “Been working on a skiff project and using all FGCI products. They came highly recommended by my friends who are boat builders. It is the highest quality resins, glass, and gelcoat for the money. They made it really easy for a newer person to boat building. The customer service is phenomenal and they are always knowledgeable and ready to help with any questions I had.”