Posted by Jeff Smith on 2/1/2016 to Magazine Articles
|How to Stop Rust With POR 15|
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Because we're such conscientious hot rodders, we decided to take the time to read the directions. As with painting, surface preparation is the key to success. We scraped, chiseled, and wire-brushed the surface to remove all the loose rust and then vacuumed the trunk floor clean.
Then it was time for the first step: POR-15's heavy grease and oil remover. This cleaner is reserved for very greasy surfaces, but we felt it couldn't hurt. We used gloves and the supplied dust mask since many of these chemicals are hazardous. We followed the degreasing step with a fresh water rinse, which we allowed to dry before moving to the next step.
This prep was followed by a zinc phosphate coating that we applied with a brush and allowed to sit on the surface 15 - 20 minutes then rinsed with water and left overnight to completely dry. If you try to rush the process and the surface is not completely dry, it's possible the hard coating will not adhere properly and it will eventually lift off.
We poured some of the solvent into another plastic cup to clean the paint brush. It only took about an hour for that nasty solvent to dissolve the plastic cup! Obviously, these are materials that should be treated with respect. Use containers that will be disposed of properly. A tin coffee can is probably best.
To finish off this trunk resto, we added a rear deck lid spoiler from Classic Auto Parts to replace the missing one that allowed water to enter the trunk. The rear spoiler (PN F6768-12181-A) bolted on with no hassles. We also added a new trunk lock from Classic (PN F67-10266-LK).
The next day, we returned to the trunk and applied the silver base coat that seals the rust. As per the directions, we ladled the paint into a disposable plastic cup and resealed the can, being careful not to spill paint onto the lid sealing surface. We also used plastic wrap under the lid. It took surprisingly little paint to coat most of the trunk floor.
With the trunk floor now finished off with the silver portion of the POR 15, it was time for the black coating. We merely brushed the paint on, just like the silver coating. When coating larger areas, you can spray POR 15 with a gun, but be sure to wear a mask and carefully clean every orifice of the spray gun before the paint dries. POR 15 cures by using the humidity in the air to aid the drying process. POR-15 also warns that if either the silver or black coatings dry on your skin, they will only come off with time. We then finished the trunk with Plasticoat's spray-can splatter paint and new weatherstripping from A&M SoffSeal to keep our new trunk clean and dry.
This same Camaro needed a tune-up undern the back window to keep water out of the trunk. As you can see, there were several rust holes but nothing bad enough to warrant replacing the panel. We performed the same cleaning and degreasing operations as on the trunk,in preparation for the silver POR 15 coating.
Here's the rear window ledge with the rust cured with the POR 15 silver paint.
Next, we mixed up two equal amounts of the POR 15 putty, making sure to mix it thoroughly.
We then applied the putty with our fingers and smoothed it with a small amount of water. The following day, after the putty had cured, we easily sanded the areas smooth with a Dremel tool and a tiny sanding drum. The putty dries absolutely rock hard, yet it sands very easily. This is great stuff.
The final black topcoat will only partially show after the rear window is reinstalled. This coating will not fade in the sun and will look good for years. The whole process took only a few hours of actual work and is far less expensive than sheetmetal surgery.