Service
The step that decides whether a finish lasts twenty years or one season.
Media blasting drives an abrasive against a surface under pressure to strip paint, powder, rust and mill scale back to clean bare metal. At Unlimited Powder Coating in Hackettstown, New Jersey, it is both the prep behind every coating job and a service on its own: bring a part to be stripped and take it back bare, or leave it and have it coated here.
A coating is only as good as what it grips. Powder sprayed over old paint, flash rust or degreaser residue will look right on collection day and lift in sheets within a season. Powder sprayed over properly blasted metal is a bonded shell.
So blasting is built into the price of powder coating here rather than sold as an extra, and the cost of a job tracks the prep far more than it tracks the color. Surface preparation is not a step before the real work; on most parts it is the majority of the labor.
Different metals want different abrasives. Heavy rust on structural steel takes an aggressive cut. Cast aluminum, thin panels and alloy wheels take something gentler that cleans without etching or distorting. The wrong media on the wrong part shows up as pitting, warping, or a surface too polished for powder to key into.
If a part is a mix, a steel frame with aluminum brackets for example, it may get treated in stages rather than blasted in one pass.
Blasting is mechanical. Some coatings come off faster chemically, especially thick layers of old paint or undercoating sitting in seams and corners where abrasive cannot reach. Chemical stripping and rust removal covers that side, and plenty of jobs use both: chemical first to take the bulk off, then blasting to leave a clean, keyed surface ready for coating.
It tracks the part and its condition, not a flat rate. A small bracket with light surface rust is quick; a trailer frame under decades of paint and undercoating is not, and a part with box sections and seams takes chemical work as well because abrasive cannot reach inside them. Send photos and say what the part is made of and what is on it now.
You can, and you should do it quickly. Freshly blasted steel is chemically clean and starts to flash rust within hours in humid weather, which is exactly the contamination you just paid to remove. If you are taking parts away bare, have the primer or paint ready before you collect them. If they are being coated here they go straight through to the booth.
Both are routine. A motorcycle or bicycle frame gets media chosen for its tubing rather than the aggressive cut used on structural steel, and everything that cannot take heat comes off first. Radiators and heat exchangers need care around the fins and cores, which distort easily, so say what the part is before it arrives rather than after.
They describe the same process; media blasting is the more accurate name because the abrasive is not always sand. The media is chosen to match the metal, an aggressive cut for heavy rust on structural steel and something gentler for thin panels or cast aluminum that would etch or distort under the harsh stuff. Choosing wrong is how parts get ruined.
Not when the media and pressure are matched to the substrate. Thin sheet metal, aluminum and delicate castings need a softer approach than a trailer frame, and that judgment is most of the skill. Tell us what the part is and what it is made of before it arrives.
Yes. Blasting is available on its own if you are painting it yourself, sending it out for plating, or just want to see what you are working with before deciding. Bare steel starts to flash rust quickly once it is clean, so plan what happens next before you pick it up.
