Build-up – Frame Effect

Problem Description:

Build-up at edges, also known as the frame effect, refers to the accumulation of paint in a thicker layer particularly around the edges of furniture surfaces during the painting process. This phenomenon typically results from improper application techniques or inadequate surface preparation. The frame effect causes the paint at the edges to appear darker and thicker, preventing the formation of a smooth and even finish.

Possible Causes:

• Excessive Paint Application: Overloading the brush or roller with paint can lead to accumulation, especially at edges. This results in uneven spreading and thick layers forming at the borders.
• Low Viscosity: Paint with low viscosity tends to run or fail to adhere properly on the surface, causing excessive build-up along edges.
• Insufficient Drying Time: Applying the second coat before the first coat has adequately dried can cause paint to accumulate at the edges, as the new layer does not spread evenly over the base layer.
• Surface Preparation Deficiencies: Presence of dirt, oil, or dust on the surface impairs paint adhesion, contributing to thicker paint build-up on edges.

Solutions and Precautions:

• Apply Thin Coats: Paint should be applied in thin layers, allowing sufficient drying time between each coat before applying the next.
• Select Appropriate Paint Viscosity and Thinning Ratio: Paint with too low viscosity cannot resist gravity and will run, causing edge build-up. Therefore, proper paint selection and correct thinning (using suitable thinner or water according to the paint system) are essential.
• Thorough Surface Cleaning and Preparation: The surface must be thoroughly cleaned from dirt and oils before painting. A clean surface promotes even adhesion and prevents edge build-up.
• Adhere to Drying Times: Allow each paint layer to fully dry before applying subsequent coats. This ensures even spreading and prevents the frame effect.

Summary:

Edge build-up or frame effect in furniture painting generally arises from excessive paint application, incorrect techniques, or improper material selection. Preventing this issue requires correct application methods, applying paint in thin coats, and meticulous surface preparat