Problem : artistic brushes creation (empty overlap)

[Black rainbow]

Hi lads,

I am french, sorry for my English :

I try to create artistic brushes but when I try them, when there is an overlap, this overlap is empty

You will surely understand better with the photos 

Can you help me please ? 

Very best

[Kurt Gold]

Can you share a sample Illustrator file (.ai)?

There can be several reasons why this happens.

[Black rainbow]

Hi Kurt thank you for your message, I have resolved the problem with the frederiks answer,

Very best

[Ton Frederiks · Accepted solution]

Maybe this helps:

[Black rainbow]

It works perfectly thank you very much Frederiks

[Ton Frederiks]

Good to hear that helped.