Save the snails!

Seems like a good way to make them stand out to actual predators.

They have camouflage for a reason

This is a really smart idea - as long as they're painted with something that won't hurt their shells :)

Does that make them faster, too?

warning coloration. brightly colored animals tend to be very poisonous and other animals avoid them

As a kid I read this old traditional tale about a snail that wanted to be different and so when the time came to make his shell, he made it all colourful. Then some little kids found him and started playing with him and poking him with sticks. In the end, he ended up breaking his shell and escaping, nearly dead, then making a regular shell.
Moral of the story: little kids are dicks.

And intoxicate Them With nail polish ? How's that a better idea? The shells are just cells, it's tissue that can be repair when damage occurs. nail polish is full harmful components