Can I patch a vinyl pool liner leak myself?

Yes, you can fix a small leak in a vinyl pool liner with a patch kit from the pool store. Find the leak by looking for bubbles with the pump off or using leak detection dye. Clean the area, apply a rounded patch with adhesive, and hold for 30-60 seconds. This works for tears under an inch or pinholes, but call a pro for seam leaks or long gashes.