Yes I sanded it to try getting a nice and flat surface.
I used water but since I’m using an electric machine I used just a little bit, not enough so that created a white/pink paste that filled this little bubbles I was not aware of.
I might need to insist a little more with the torch to get rid of them.
Anyway, I quickly tried sanding in water like you did and it seems to be working reat!
But my thinner sandpaper doesn’t last one minute in the water.
Thanks a lot for the tip! 🙂