Fill tool causing seemingly random sections to be painted

That is weird. I wonder if it is UV related? I believe there is a fill threshold adjustment you can make to the fill paint brush that should detect. You might want to try playing with that.

Don't know what's causing this. Could you provide your .blend again, in this state, where the problem occurs?

https://drive.google.com/file/d/1xkUVn4qRSrkiUgGA_XSLURv4nhhALbhi/view?usp=sharing

here is the blend file. hopefully you can find something that I couldn't. Thank you for your help!

mmateocm that's your .blend1 file. Can't open that. (that's sort of a backup file..)

Whoops! My bad. Here, this should be the right one then https://drive.google.com/file/d/1R5Qoka0rX2tnZqWEFHQgsUKYIR_kQ9PR/view?usp=sharing

This is really strange! I have no idea (yet) what is causing this. Maybe it's a bug???

I will look at it a bit more tomorrow, but I can't guarantee that I will find what's wrong...

In the meantime, as this only seems to happen when filling, I would suggest you fill all the metal pieces with 'blue' and after that fill the wood pieces that are affected,  with 'brown'.. Then you can start painting and should not have any problems anymore (I hope!).

Wow that is crazy weird. I can't explain that, but hopefully this is a fluke. I did not have this problem when I was going through this course so maybe this is a one time issue?

I would say just do most of the painting and then go the the image editor and paint away the abomination haha. Then move on for now. so you can finish. @theluthier can you tell what is going on with this?