Thomas Modification ideas: assistance needed

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There are many ways on the Internet with different methods, what I do is first soak the items to be spray painted in hot water using dish soap that is pure with no unnecessary ingredients like Palmolive Pure & Clear. While in the hot soapy water I use a clean, soft brush, one that I only use for this and nothing else. Rinse well and let air dry. Then, when its dry, Use a soft tooth brush only used for doing this, dip it in alcohol and scrub the item paying particular attention to the nooks and cranny's and let dry.

The best painting at least in my opinion is using and airbrush. A thin layer of primer is used first as its made to adhere to different materials better. Then thin layers paint can adhere easily to the primer and harden quickly enabling more layers to be applied. The thin layers also maintain all the details from being covered up. IMO, using brushes and rattle cans goes on too thick, can easily hide details and the thickness is more prone to cracking and chipping. These are all my unprofessional opinions and how I do it. There are many other ways. But how many of us have been so disappointed in after creating a beautiful custom only for the paint to crack and chip away because it could not adhere very good due to the releasing agents.