Lydia walks through the key differences between three common primer types — water-based, oil-based, and shellac — breaking down when each one makes sense on the job. Water-based latex works well for new drywall and light-duty applications, oil-based handles tougher adhesion challenges like glossy or dense surfaces, and shellac is the heaviest hitter for severe stains, odors, smoke damage, and extreme sealing needs. She also covers the practical side: cleanup requirements, smell, viscosity, and safe disposal all vary significantly between the three. Reading the back of the can before committing to a product is a recurring theme throughout.

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