Acrylic Auto Paint

Hi, Im having problems with the above, I mix acrylic paint with 1 part 1part self acrylic thinners, when i spray my gun I get spider web like effect, I adjusted the flow of paint and air flow, but still occurs, is the ration paint thinners for the problem? Thx

I am not an expert.
But
I think your mixture is too thick.
I would try to paint mixing 20% to 80% thinners. (4:01)
The each layer is thinner, the better.
Many light coats rather than a pair of thick.
Try this and see how you go.
(You can not even need to go thinner than 4:1)

sounds like the original painting is acrylic and you have a reaction