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Tag Archives: Powder Coating

  • Why Powder Coating is Better Than Spray Paint

    For some unknown reason a lot of car guys are very hesitant to take the plunge into the world of powder coating. This means a lot of people are missing out on all the benefits powder coating has compared to other types of coatings. It seems like there is some fear of powder coating that is preventing car enthusiasts from buying the equipment and starting to coat on their own. You might be surprised to learn that in some cases it's actually cheaper to powder coat something than painting. The truth is that there are fewer tools and materials needed to powder coat compared to painting. For instance there are many more consumable materials needed when painting and thats not including the paint itself. If you were to compare the differences between painting or powder coating a part for your car, the first step would be to take it down to bare metal.

    From here the processes are different, and also vary in the time required to complete each.

    Painting:

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    If you're coating the part with a traditional 1K or 2K paint the piece must be sealed to prevent corrosion and rusting. Using epoxy primer, which can be applied directly to bare metal is the best option. Automotive paints generally shouldn't be applied directly to bare metal because there could be adhesion issues. If you're spraying the part with a 2K primer you will need the correct activator which means another cost associated with the job.

    Ok so now that you went out to buy more activator and sprayed the piece with primer, you then have to apply a top coat. Not only will you need the paint, you will also need the reducer and activator if you are using a 2K top coat. Just when you think you're finally done you realize there is still one more step, applying clear coat. The clear coat requires its own activator as well, that's more money out of pocket if you don't already have it. At this point you think you may have spent too much time and way too much money, but the end result does look great.

    With Powder Coating you first make the investment in a powder gun and oven. From there all that is needed is to buy the powder itself. Pretty much any electric oven will work (just don't use one you cook food with!). No special activators, reducers, or other chemicals are needed (other than PRE, to clean the bare metal).  Prepping a metal object to paint or powder coat is a similar process, the only difference is that any non-metal pieces must be removed since they will not be able to withstand the heat needed to cure the powder.

     

    Lets see how they match up.Paintvpowder

    When comparing paint and powder, durability is always #1 on the list. Before we compare the two we first have to mention the different types of paint. Generally speaking, 1K paints in an aerosol can are worlds apart from the paint on your car. Most 1K aerosols paints are usually enamel paint. The down side to enamel paints are that they never fully dry, they just harden when exposed to air. Additionally they will break down and essentially melt if they come in contact with a solvent.  The paint on your car is known as a 2K catalyzed paint. This means that before the paint is applied an activator is mixed into the paint. The catalyzed paint will actually change its chemical make up and cure, making it resistant to solvents. While a catalyzed paint is much stronger than aerosol paints it still does not compare to powder.

     

     

     

    Density

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    Once powder fully cures it's much harder than traditional paint, making it much more scratch and chip resistant. There's a reason almost all high-end custom cars have powder-coated frames!  A powder coated part that is exposed to extreme conditions is less likely to chip off and peel like paint would.

     

    Flexibility

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    Powder isn’t just harder than paint, it's also extremely flexible. We've tested the flexibility of powder by applying it to tin foil, crumbling it up, and flattening it back out. The results were incredible, none of the powder had flaked off! Try doing that same test with spray paint, more will end up on the floor than the foil!

    Thickness

    One of the visibly noticeable differences between powder and paint is the actual material thickness. A functional coat of powder can be up to 10X thicker than paint. This means that there is a greater protection between the outside world and the bare metal.

     

    Corrosion Resistance

    When prepped and applied correctly, powder does an incredible job of preventing corrosion because of how strong it is.  When a painted surface is scratched it is much more likely to go down to bare metal.  At that point corrosion will begin and start to spread.  Since powder is so much harder than paint the chance that a scratch will reach bare metal is very unlikely, making it the perfect coating for chassis and suspension parts.

     

     Ease of Cleaning Up

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    If you've spray painted before, you'll know how awful overspray can be. No matter how much you prepare, it seems to get everywhere. Cleaning up overspray can be very difficult because it requires the use of harsh chemicals. In its raw form, cleaning up powder is no different than cleaning up sugar and flour spilled in the kitchen. Simply sweeping it up or using a vacuum is all that will be needed.

     

    Reclaiming/Reusing Powder

    2K paint must be used once it is mixed, powder does not require any additives. This means you can use it at you own leisure. Powder under normal circumstances does not dry out or cure even when it's left out.

    If you really want to be frugal, powder that doesn't stick to your part can be reclaimed and reused by sweeping it up and sifting. Just make sure you use a very fine screen to sift so that there are no other contaminants in the powder. This may be very tricky to do at home, but with some care it can be done.

    Eco Friendly Application

    Traditional paint guns atomize the liquid paint into the air while a powder coating gun uses air to propel the powder towards the part. As the powder is leaving the gun a slight charge is added to the powder. The powder sticks to the grounded part because the powder has a slight charge when it leaves the gun and it's then attracted to the grounded part.

    Unlike liquid paints that are sprayed, there aren't any may health threats to being in the same room without a mask on. Powder coating does not even require the use of a typical carbon filter mask, just a simple dust mask to keep from directly inhaling the powder when spraying. Because powder is heavier than atomized paint, overspray will fall on the ground right around the part and won't float in the air for extended periods of time.
    Check out the Eastwood Blog and Tech Archive for more How-To's, Tips and Tricks to help you with all your automotive projects.  If you have a recommendation for future articles or have a project you want explained don't hesitate to leave a comment.

    - James R/EW

  • How to Prep Metal For Powder Coating

    Much like painting and welding, preparing metal for powder coating is multi step process that must be followed in order to have the best results.  If any of these steps are missed or not done properly your end product will risk having flaws.

    What Can Be Powder Coated?

    During the curing process the part will reach 400+ ºF, this means that only certain materials can actually be coated.  With that said any parts with plastic, rubber, gaskets of any kind and wiring will have to be completely removed before starting to prep the metal.  With that said, anything with moving parts must be taken apart and coated separately, then reassembled after.  It the powder is applied across a moving joint the curing process will lock the two together.  Depending on the type of part you will be powder coating, different levels of disassembly will be required.  For example a valve cover or set or coil spring will not require any disassembly since there are no moving parts.  More complex parts like alternators, Carburetors, and Steering components will require a lot of time devoted to making sure all of the pieces are properly taken apart and sealed.

     

    Preparation Steps

    Step 1

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    First your part must be fully disassembled and any pieces that will not be coated removed.

    Since I will be powder coating these engine brackets, removing all the bolts was the only disassembly needed .

    If, for example, you were powder coating a carburetor, all of the openings must be plugged with rubber plugs to prevent powder from getting into any of the crevasses and openings. Additionally any moving parts must be either removed or taped up using high temp masking tape.  When disassembling complex parts like this its important to take pictures along the way.  Check out this article which talks about the importance of taking pictures during your project.

     

    Step 2

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    The next step in the process is cleaning the metal.  There are a few methods of doing this but first you always want to remove any dirt or grease by using Eastwood PRE Painting Prep, spray a liberal amount on a rag and wipe down the surface of the part.  this will remove dirt, oil, grease and grime from the outside of the part.  During this step you will not need to worry about removing any paint or other coatings that might be on the surface, this will be dealt with next.

     

    Step 3

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    This step will take care of any coatings that are currently on the part.  By far most effective method would be to Media Blast the part but if you do not have access to a blaster a good sanding with 80-120 grit Sand Paper or a Flap Disc on an Angle Grinder should be able to handle the job of stripping off any coatings on the metal.

     

    Step 4

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    Now that any previous coatings are removed, use a blow gun to remove any dust. Instead of wiping the part down, you should completely spray down the part with PRE Painting Prep and then let it air dry.  If you were to wipe it down with a rag there is a potential that contaminants on the rag or towel could be transferred to the part.

    Step 5

    If you want all of the exposed metal coated then you can skip this step.  For most parts there are certain areas that you will want bare metal to remain.  In order to mask off these areas the use of a special type of masking tape is needed.  Paint Masking Tape will not hold up in the high temperatures that the oven will reach.  High Temp Masking Tape is the answer to this dilemma, coming in sizes from 1/8" to 2" this tape will be able to cover any size area needed.

    Just make sure you don't touch the part with your bare hands it is ready for powder coating.

     

    Check out the Eastwood Blog and Tech Archive for more How-To's, Tips and Tricks to help you with all your automotive projects.  If you have a recommendation for future articles or have a project you want explained don't hesitate to leave a comment.

    - James R/EW

     

  • Powder Coating FAQ

    Powder coating is a dry painting process that uses a fine powder with the consistency of powdered sugar, and an electrical charge to coat an object. Then the piece is baked in an oven at 400+ degrees Fahrenheit to make the powder melt and flow together. Once it is cooled and cured the powder coat has formed a solid plastic coating over the entire surface that is much more durable than regular paint.
  • Project of the Week- Powder Coating a vintage Mini Bike

    Here at Eastwood we're always working on new products, but we always make sure we're testing products we've offered for quality. Recently JR decided to powder coat a vintage mini bike to show off some of our Hot Coat Powder and test the outcome of our metallic powders.
  • Powder Coating Aluminum and other Cast Parts

    Larger cast aluminum parts like transmission cases, cylinder heads, engine blocks, etc. can be difficult to get the current to pass through when powder coating a cold part and poor powder adhesion can be the result....

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