I have been renovating some interior walls that were damaged through age and the process of removing wallpaper. I didn't want to replaster, and I wanted a very thin covering, so I opted for a big-brand wall smoothing paste (or actually "Enduit de Lissage" in the local language). There are similar products from a few manufacturers.
The product wasn't as easy to employ as suggested (lots of sanding and touching-up is required) but the results look acceptable so far.
However, the product is expensive and I am now wondering whether there is a big difference between it and joint filler or joint finisher compound which seems a fraction of the price.
Is there any advantage to the specialist product?