Yes, you might need to dilute the paint by 10%-20%, but the amount depends on other factors like temperature, material thickness, and power of the device. You should find the recommended amount into the manual.
If you don’t see any instruction regarding diluting percentage there, we suggest you start at 10%. Test the result and slowly add water if needed. Test the result on a block of scrap wood or bag.
It’s not wise to use thick paint as it can hurt the device. A little bit of trial and error and you’ll find the balance