Advanced Paint System: Shot Blasting & Electrostatic Application

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What happens here

The discussion shifts to the painting process, a critical step for durability. The Southland representative explains that they use a 'wet paint' system, not powder coating, arguing that wet paint is preferred in the automotive industry for heavy-duty vehicles like trucks. Before painting, the steel undergoes a 'steel shot blasting' process, which creates a precise, rough surface profile (like a nail file) that is meticulously audited for optimal paint adhesion. This textured surface is crucial; a smooth surface would cause the paint to peel, while an overly rough one would show through the paint. The paint department head, Tyson, then explains the 'electrostatic painting' process: the entire trailer is negatively grounded, and the paint is positively charged as it exits the spray gun. This creates a magnetic attraction, causing the paint to wrap around and adhere to every surface, including hard-to-reach areas and crevices, ensuring superior, comprehensive coverage and a strong bond. This process is audited both wet and dry to ensure the precise amount of paint is applied.

Goal: Describe the specialized paint preparation and application techniques (steel shot blasting and electrostatic painting) used to achieve superior adhesion and comprehensive rust protection.

Tools and materials

Clamp — Grounding the trailer for electrostatic painting
Electrostatic Paint Gun — Applying paint with an electrical charge for superior adhesion
Paint Booth — Controlled environment for painting
Wet Mill Gauge Defelsko Positest DFT — Measuring wet paint thickness during application
Steel Shot — Blasting the steel surface for paint prep
Wet Paint — Coating the trailer frame

What they say

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you guys also do something a little different with your paint though as well right yeah 100% a little bit different just like your dump trailer we don't powder coat at Southland it's wet paint and if powder coating was a good idea we said this before if powder coating was a good idea your truck would be powder coated so you use a similar process that for when they when they paint their trucks they're not powder coating their trucks you're not powder coating your trailers the first thing we need to do to the steel to prep the steel is to give it this profile you can feel that stand this is a rough kind of like a nail file and Emory board you know it's it's a rough finish on it if the steel was smooth the paint would just peel right off but we have to rough it up first we actually audit this the Peaks and The Valleys we audit that so we have the correct the the height the the M build on this thing the the the the profile so that the paint can stick to it and saturate I'll show you this so if I understand this correctly if it's too smooth the paint peels right off just like WRA yep and if it's too rough you're going to see the top so you actually audit it so you actually go through with a tool and you make sure that it's absolutely right we audit it wet and dry so you do two audits so when it's wet you check it to see what it's like going on wet cuz you're going to lose some as it's drying it's going to shrink down and then we audit it again afterwards to make sure that we have the right amount of paint on the trailers what do you use though so while we're here so this is where our shot happens this is our steel shot so not sand but steel we control and we can regulate the grit of this and we blast it through the guys are in here in their hazmat suit guys and ladies the team members in here in their Hazmat and they're blasting and prepping the the steel so the steel is prepped we audit that before the paint process goes on and the paint is a wonderful mixture it's wet paint plus the additives into it that get sprayed on to this steel audited and then we can even wind but now you do something special from that point and I think that's where we got to bring static is crazy Tyson have a look

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