Chemical Process
Function of thinner in a paint is to

Accelerate the oxidation of oil
Form a protective film
Suspend pigments & dissolve film forming materials
Prevent gelling of the paint

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Chemical Process
Mineral oils (e.g. petroleum oils) are preferred over fatty oils (e.g. mustard oil, ghee, tallow, palm oil, olive oil etc.) as a lubricant due to its

Poor oxidation stability and high gum forming tendency
All of these
Hydrolysis tendency in presence of water
Greater tendency of decomposition at elevated temperature

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