I tried this, I used clear plastic from a craft store and used packing tape to hold it in place. It didn't work because moisture collected on the inside of the tape making the fog lights useless in the fog.
If you don't use your fog lights you could make a opaque cover for them. If you can seal around the lights it would be the same as the cover.
I only tried this because my valance was ruined by a deer strike, the paint started popping off a month after.
|