Hey guys! I haven't posted in a while. But im getting ready grind down some rust spot I have on my floor boards. I'm gonna treat them with por15 and was wondering what could I prep the metal with.

Any suggestions would be great!

 

If you don't want to mess around, use straight muriatic acid, it will dissolve the rust and give nice shiny metal.
You have about 24 hours before it flash rusts again.
you also can use phosphoric acid which will convert any rust left over to iron oxide.
Use a respirator/safety glasses and chemical resistant rubber gloves and rinse well..
If it's pitted pretty well and grinding/sanding will take too much material off to get to those areas, use a combination.
Muriatic >rinse> phosphoric >rinse >seal

I used muriatic on my drivers doors last summer and rattle can'd it. It still looks good enough.
I used a chemical resistant spray bottle, sprayed the acid on, rinsed it with plenty of water, let it dry and rattled primer/paint on it.
I don't recommend windy days if outside and not in any part of a driveway you care about. It will eat pavement and probably etch concrete.
Since it's floorboards you most likely won't have to worry about that though, as you'll be sponging up the excess.
Keep the other door open to allow airflow thru even though you'll be wearing a respirator you don't want the acid fumes hanging around.

 

I just did my new 38 gallon rear tank with Por15. I used as well as (links to amazon) I'm sure other stuff will work, but i'm lazy and prefer to keep the same brand throughout a project instead of researching to see what works and what doesnt work. I honestly dont know if there are some products out there that dont react or work well together. I will say the Por15 cleaner stuff and prep worked perfectly.

 

I've been using Ospho lately and have been pretty happy with it.

Ospho Rust Treatment - Since 1947

Once it dries I just over it with a rust paint.

 

UPDATE guys I just finished up my little project yesterday. I used rubbing alcohol on a shop towel and waiting till it dried man the por15 rust preventive is great stuff!

 

On my research the POR15 required metal etching to adhere to clean metal surfaces - could you post an update on how well it holds up at a later date?