Gelcoat Wax Additive – FGCI Sanding Aid

Gelcoat Wax Additive


By adding our Gelcoat Wax Additive, Sanding Aid, to the final coat of gelcoat, your project will have a tack free, sandable, lustrous and glossy finish. This can be maintained through a buffing schedule. Down here in Florida, boats typically need a good buff and wax every 3-4 months.


Wax Additive for Gelcoat


Our FGCI Wax Additive for Gelcoat, called Sanding Aid, is to be mixed into the final coat before application. This creates a tack free, sandable gelcoat finish once fully cured. Do not apply on top of a layer with wax in it. This is only to be used during a wet layup application when building up millage.

Pro tip: Do not add more than the recommended amount per volume. Doing so will create fisheye and uneven finished coat.

With FGCI, you can rest assured that your batch will be within specs every time, with the same color, viscosity, strength and application characteristics as you would expect from a high quality product. After all, we haven’t been in business for over 60 years without ensuring our quality standards are the highest, and accompanied with the best customer service!

PLEASE NOTE: This information is provided in good faith and correct to the best of our knowledge. No warranty, guarantee, or representation is made as to the sufficiency of the information for the safe use of the product, nor to relieve the end user of any Federal, State, or Local regulatory responsibility.

Sanding Aid, or Wax Additive as it is also referred to, creates a wax barrier over the surface of the gelcoat or resin to seal it off from the air, allowing it to cure quicker, tack free and with a shine. This product should only be used on the final coat. This product works in conjunction with MEK-P hardener, which still must be added to get a cure.

Amount of Resin without Wax  Wax additive to add
1oz 20 drops
1 pint 1/2 oz
1 Quart 1oz
1 gallon 4oz

*NOTE: The wax can solidify in the container under 70 degrees. The material is still usable, it just needs to be warmed up past 70 degrees. Do not heat past 75F and then add to the resin, which can affect your curing times negatively. Caution: material is flammable, so sunlight is recommended.



  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.”
  2. Brian Lewis

    “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.”