You can buy clear plastic which is sticky on one side, and stick it on. Some people use it for covering books. Some people in Australia call it contact. It is clear plastic, so people don't even see it. In Australia, you can buy it in shops selling stationary supplies. At least some brands shrink a little when heated, so you can make it fit unusual shapes using a cigarette lighter. In S E Asia, many motorbikes have in on all the parts which may get scratched. Some people run a business sticking it on motorbikes. I had it stuck on the bar of my bike in S E Asia. It is still good after 3 years, including getting wet in the rain many times.

In Australia there is also a spray on product which forms a clear plastic layer. Check for it in shops selling car accessories.

Things available in Australia, are probably available in the US, and many other countries, maybe the same brand, maybe a similar product.