Proper application is critical; otherwise, concentration-cell corrosion will occur. Proper application means: "Clean the area thoroughly, removing all rust, scale, oil, and grease.
Ensure the surface is dry and free of contaminants."
It's not as though you just spray this and pretend it's a "forever" product.
Yes the surface has to be scale free and clean enough for proper adhesion, and eventually it will develop cracks and water will wick in, at which point it will need stripped off and redone, at least at the areas where water got in.
The other alternative is spray on some permanently fluid or more readily available type solvent based, thick petrol or animal wax or polymer which is easier to clean off with abrasion or the right solvent, but won't last as long.
Then there is option 3, put on the undercoating and also put on the less permanent goop to seal the cracks and chips that will develop.
It's not that different from refinishing headlight lenses. Do you put a hard clear coat on when finished then have a lot more labor to strip that off when it degrades, or just polish-wax them more often as needed?
It's also like paint itself. You can just wax bare metal and keep doing it, or just paint it, or paint it AND wax it. Make sure each coating layer is sufficiently cured before adding another layer over it.
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Ensure the surface is dry and free of contaminants."
Yes the surface has to be scale free and clean enough for proper adhesion, and eventually it will develop cracks and water will wick in, at which point it will need stripped off and redone, at least at the areas where water got in.
The other alternative is spray on some permanently fluid or more readily available type solvent based, thick petrol or animal wax or polymer which is easier to clean off with abrasion or the right solvent, but won't last as long.
Then there is option 3, put on the undercoating and also put on the less permanent goop to seal the cracks and chips that will develop.
It's not that different from refinishing headlight lenses. Do you put a hard clear coat on when finished then have a lot more labor to strip that off when it degrades, or just polish-wax them more often as needed?
It's also like paint itself. You can just wax bare metal and keep doing it, or just paint it, or paint it AND wax it. Make sure each coating layer is sufficiently cured before adding another layer over it.
Thank you!