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Randomising Coating Test Positions: Reduce Location Bias
A split-panel comparison can be influenced by where each product is placed. Vary the allocation across comparable test panels instead of always giving one product the same position.
Updated · NANOLAB Knowledge
Identify positional differences
Edges, horizontal zones and areas near runoff paths may experience different conditions. Cleanliness, finish history and application access can also differ. A result from one position therefore cannot automatically be attributed to the coating formula.
Assign before seeing results
Choose a documented allocation method before application and keep the product codes traceable. Across suitable comparable panels, vary which product occupies each position. Keep treatment boundaries distinct and use the same supported application process for each system.
Interpret the pattern
Review whether a result follows the product or the position. Keep records of preparation, exposure and maintenance alongside the outcome. If one location repeatedly behaves differently regardless of product, investigate that condition before declaring a winning formula.
Frequently asked question
Does random placement make every panel comparison conclusive?
No. It addresses one source of bias; representative surfaces, application quality and repeated observations still matter.