What effect does surface porosity have on paint absorption?

What effect does surface porosity have on paint absorption?

• A. High porosity results in less paint absorption
• B. Low porosity requires more paint for coverage
• C. High porosity leads to more paint absorption, often needing additional coats
• D. Surface porosity does not affect paint absorption

Answer: (C)

High surface porosity increases the absorption of paint due to the presence of many small pores or voids that can soak up the liquid component of the paint. When paint is applied to a porous surface, the liquid resins and solvents seep into these pores, which leads to more of the paint being absorbed rather than remaining on the surface to form a film. This increased absorption can often result in the need for additional coats to achieve the desired coverage and finish. Surfaces like concrete or unsealed wood, for example, are highly porous and will draw in paint much more than smooth, non-porous surfaces. As a result, when dealing with porous materials, it's common practice to apply a primer or sealant first to reduce absorption and improve the overall finish.

High surface porosity increases the absorption of paint due to the presence of many small pores or voids that can soak up the liquid component of the paint. When paint is applied to a porous surface, the liquid resins and solvents seep into these pores, which leads to more of the paint being absorbed rather than remaining on the surface to form a film. This increased absorption can often result in the need for additional coats to achieve the desired coverage and finish. Surfaces like concrete or unsealed wood, for example, are highly porous and will draw in paint much more than smooth, non-porous surfaces. As a result, when dealing with porous materials, it's common practice to apply a primer or sealant first to reduce absorption and improve the overall finish.