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The application of a motorcycle rim primer is the first step before applying any of the types of motorcycle rim paints. This preliminary practice takes into account the particular material that the rim is made of : this is commonly either aluminium, steel, or an alloy.
The function of motorcycle rim primers is to provide a chemical bond between the metal and the paint, to prevent the clearcoat from peeling off. This rim primer plays a key role in protecting the metal from rust and ageing.
Whether it is in a can (to be applied with a spray gun) or in an aerosol, the product is the same. It is necessary to use the appropriate primer: we do not use a metal primer on aluminium because it will not last.
For this, there are primers for ferrous metals and for non-ferrous metals.
Applying a primer to a motorcycle rim in the right way
If the wheel is already painted :
Allow the paint to adhere by superficially sanding the existing coating, with an abrasive grit that is neither too fine (no adhesion) nor too coarse (visible scratches). No primer for adhesion or levelling is normally needed, and one can paint directly, unless of course the background has scratches or holes.
If the wheel has been stripped:
The paint has been removed from the rim, by sanding, sandblasting or chemical stripping: the metal is bare. It is important to clean the rim thoroughly with a strong degreaser to remove any fingerprints, grease, silicone or other contaminants.
Then, before applying a primer to smooth the rim, apply an aluminium or iron primer. One thin coat is better than two thick ones!
This can be followed by the trim primer, which will create a thick layer of primer on the motorcycle rim that dries quickly and is easy to sand.
After a few hours of drying, using a P320 type abrasive soaked in water, this primer can be sanded down to give the rim a smooth, superfine surface.
How to repair large defects and bumps on a motorcycle rim ?
There is a product adapted to this kind of situation: it is the « aluminium putty », a variant of the usual putty, but harder and stronger, which adheres to metals. This putty contains a percentage of metal that makes it even harder after drying.
As with any putty application, it must be sanded and then primed to obtain a surface ready for painting.
What is the best primer?
All of our simple primers are high performance. They are each specialised for one type of metal. Properly sprayed on a sound surface, there is no need to worry about possible delamination.
However, if you are looking for a primer that will adhere anywhere and is unassailable under any conditions of use, temperature and corrosion, then there is indeed an extreme industrial primer: Epoxy Primer 294.
