**System Information**
Operating system: Windows-10-10.0.17134 64 Bits
Graphics card: GeForce GTX 1060 6GB/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 388.71
**Blender Version**
Broken: version: 2.81 (sub 8), branch: master, commit date: 2019-09-07 20:51, hash: `rB4764362ebb91`
Worked: (optional)
**Short description of error**
When using a boolean modifier to unite two objects, sometimes geometry is created inside the mesh. This states a Problem as this makes it impossible to smooth out the connection between the combined Object. (It gets even worse)
Moving the objects around in a trial & error fashion can solve this issue, however that requires a lot of time and is far from optimal.
I often use the boolean modifier to join the palm of a hand with the indiviual fingers. That is also the case for the attached file, where we can see that out of five fingers only the middle finger is combined optimal.
I tried "Select" -->"Select all by trait"--> "Interior Faces" to clean up the inside topology, but it did not recognize any of it.
I have experienced the issue in several Versions of Blender: 2.78, 2.79 and now 2.8, but did not know about the report feature until the official youtube channels about bug reporting.
**Exact steps for others to reproduce the error**
1. Open attached file
2. Select Palm
3. Go into local view
4. (optional, just for reviewing) look inside the mesh
{F7722450 size=full}
5. apply modifiers
6. try sculpting
{F7722467 size=full}
{F7722422}
Thank you very much for your hard work.