You can use liquid sandpaper to de-gloss and ready paint paneling prior to re-painting. Unlike traditional sanding methods, using liquid sandpaper requires very little effort when removing glossy paint from panels. This is because it is a chemical solution that peels away existing paint layers to expose the grainy texture needed for painting. Liquid sandpaper is not a necessity unless you have a highly glossy panel. In that case, you could prepare the panel and sand it the traditional way.
There are a few important things to remember while using liquid sandpaper. It is highly combustible, so it must be handled carefully. Also, it can not smooth rough textures since it is a completely different material from sandpaper.