In this episode of The Build Show, Lydia demonstrates the critical importance of proper light checking and how revealing light can expose surface imperfections that are often invisible at first glance. Using a real-world shop wall as an example, she walks through how raking light highlights uneven patches, bulges, paint marks, and previous repair flaws—underscoring why surface prep is essential before skimming or finishing. Lydia explains common decision points contractors face, such as whether to skim, float problem areas, or replace drywall altogether, and offers practical guidance on when each approach makes sense. She also breaks down prep techniques, sanding considerations, and coating strategies to achieve a smooth, professional finish, emphasizing that quality results require patience, process, and attention to detail before moving on to final finishes like plaster or microcement.

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