Don’t let cracked plaster ruin the charm of your pre-war NYC apartment. Our complete guide helps you diagnose different types of cracks and decide between a simple DIY patch and a professional skim coating. We provide a step-by-step tutorial for minor repairs, explain the pro skim coating process, and break down the 2025 costs. Plus, get crucial information on handling potential lead paint safely. This guide has everything you need to restore your walls to a flawless, beautiful finish.