repair meshes in surface sculpting mode

[Frimasson]

I'm currently sculpting a model in surface mode.
At certain point, i was unable to do booleans, unions betweens meshes.. I had an isue with my mesh. Converting it back and forth to voxel can fix it, but i loose a lot of details.
Trying tg to fix the mesh in 3d Coat failed. I tried close holes and mest doctor without success.
When i export the model in obj, thent import it, i have holes in the mesh (see attached pic).
Even if i decimate the model before export.
The only workaround i found is to decimate a little the mesh in Zbrush to fix it before re-import it in 3dc. 

[cerokyn]

the surface mode is more for detailing, crisp textures

u should better sculpting in voxels 

[digman]

Vowels are best for Boolean operations. Booleans in surface mode run the risk of failure and more so as the Boolean operation increases in complexity. Try to get all your booleans done in vowel mode. 

Of course if you are importing an object from another program and you would need too many voxels to capture the details, then you will import to surface mode. Check the below method to see if that would help.

Another method for surface mode. 

 If you only need the object to be merged to another layer in surface mode and not need a real Boolean, then that is possible too. Right click on the layer that will be merged, you will find that operation there.

Edited May 20, 2017 by digman
added picture

[Frimasson]

I found a way to fix my issue.
If i export the model in .OBJ, delete it, import the obj, i've got holes in the imported model
If i export the model in .STL, delete it, re import ...
it works fine