Enter the gelcoat amount, catalyst amount, and the ratio into the calculator to determine the missing value.

Gelcoat to Catalyst Ratio Calculator
Catalyst Needed
Equivalent Ratio

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Gelcoat To Catalyst Ratio Formula

The following formula is used to calculate the gelcoat to catalyst ratio.

R = G / C

Variables:

  • R is the ratio of gelcoat to catalyst
  • G is the amount of gelcoat in grams
  • C is the amount of catalyst in grams

To calculate the ratio, divide the amount of gelcoat by the amount of catalyst.

What is Gelcoat?

Gelcoat is a material used to provide a high-quality finish on the visible surface of a fiber-reinforced composite material. It is typically applied to molds in the liquid state and cures to form a hard, durable layer. Gelcoat is commonly used in the construction of boats, cars, and other products where a smooth, glossy finish is desired. It also provides protection against UV rays, water, and chemicals.

How to Calculate Gelcoat To Catalyst Ratio?

The following steps outline how to calculate the gelcoat to catalyst ratio.


  1. First, determine the amount of gelcoat (G) in grams.
  2. Next, determine the amount of catalyst (C) in grams.
  3. Finally, calculate the ratio using the formula R = G / C.
  4. After inserting the values and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

Gelcoat Amount (G) = 500g

Catalyst Amount (C) = 10g