CSLB C-33 Painting & DecoratingCoating ApplicationEasy
A painting contractor is preparing a batch of two-component epoxy primer for application to a concrete floor. The technical data sheet specifies a mixing ratio of 4 parts Base (A) to 1 part Hardener (B) by volume. If the contractor has 2 gallons of Base (A), how much Hardener (B) is required?
- A0.25 gallons
- B0.5 gallons
- C8 gallons
- D1 gallon
Show answer & explanationAnswer & explanation
Correct answer: B. 0.5 gallons
The mixing ratio is 4 parts Base (A) to 1 part Hardener (B). If there are 2 gallons of Base (A), divide the amount of Base by 4 to find the required amount of Hardener: 2 gallons / 4 = 0.5 gallons of Hardener (B).
Why the other options are wrong
- A. This is incorrect; 0.25 gallons would be for 1 gallon of Base.
- C. This is incorrect; 8 gallons would be the amount of Base if you had 2 gallons of Hardener (B).
- D. This is incorrect; 1 gallon of Hardener would be for 4 gallons of Base.
Two-Component Mixing Ratio
The precise proportion, usually by volume or weight, in which the base and hardener (or activator) components of a two-part coating system must be combined to ensure proper chemical reaction and curing.
- Crucial for achieving specified coating properties and performance.
- Incorrect ratios can lead to incomplete curing, soft spots, or brittle films.
- Always follow the manufacturer's technical data sheet (TDS).
Memory trick: Ratio rules the mix, for perfect coating fixes.