PVC questions - safe paint

[Floyd R Turbo]

I want to make a spray bar out of 1/2" PVC and have the parts, but Home Depot stamps these ugly red and black marks all over their pipes and connectors. How would I remove these short of sanding, any ideas?

Also, since this will go in the tank, and I want to hide it as much as possible, is there a safe way to color it black? Sharpie?

 

[Floyd R Turbo]

Update, I figured that one side does not have any markings, so that can face the back, but what about the water safety of Sharpie?

 

[jsoong]

People have use Krylon fusion paint to spray paint the whole thing black so it will look good. Krylon is aquarium safe when dry.

 

[thincat]

If it's a SW tank the coralline will cover it up in no time at all.
A light sanding would speed that along even more.

 

[Floyd R Turbo]

It's for FW but good info for future. I happen to have some Krylon fusion black, so problem solved!!

EDIT - oops it's not fusion, it's what I bought to paint my light black. Will have to get some of the fusion...