Ok, I just finished my trailer and I need some painting advice.

1. How do I prep the steel? Is wire wheeling it sufficient or is sanding necessary?

2. Do I have to use a primer or is there a glossy non fading paint that does not require primer on steel? Any recommendations would be greatly appreciated.

3. I want to use a sponge type roller to apply the finish because I do not have a place to spray.

Thanks,
Nick