If the paint is too viscous, it can be sprayed only with difficulty or not at all.
The optimum thinning always depends on the type of paint. Please comply with the information from the paint manufacturer.
In our experience, thinning the paint is advisable.
Start with thinning of 5% and try out the spray pattern on an old piece of cardboard, for example. If the result is not yet satisfactory, thin the paint by another 5% and test it again. Do not thin by more than 15–20%. Please comply with the information from the paint manufacturer.