http://rustbullet.com/Comparison/ProdComp.htm

http://rustbullet.com/index.htm


http://rustbullet.com/IndTesting/NTS/NTS.htm

I have some light rust in the floor pan of the car. Nothing I can't get rid of with a wire brush and a bit of elbow grease. But I would like to not do it again if I can avoid it. Anyone know how well this stuff actually works?

I've used POR-15 for a while and I'm pretty happy with it. You're not going to need all of that metal prep and extra stuff that site lists. You have seasoned metal that it will stick to just fine, just scrape off the rust, clean with brake cleaner or paint thinner, then slather the POR-15 on in 2 coats. The first coat should still be tacky. You need the marine clean for really nasty used metal, metal ready for new metal or to paint over dried POR-15, and the chassis coat if the POR-15 is going to be exposed to UV light for any amount of time... you're floorboards shouldn't fall into any of these cases. So that's the same price for a gallon... but you will only need a quart at most, unless you go crazy and do the whole bottom of the car, I usually pay around $30.

Don't get a larger container and think you'll use the rest of it in a few years or so. The top layer of the POR-15 will get a hard 'pudding skin' on it since it uses moisture in the air to cure. You can keep an opened container in the fridge to extend it's life. Make sure you clean out the top of the can and lid where they seal together, otherwise the lid will get stuck to the can for good. If you squirt some inert gas (argon from a welder) into the can as you're closing it, the air will be displaced helping the open can shelf life.

The important part is cleaning the metal enough, something you'll have to do no matter what product you use. I've also heard that the silver POR-15 actually has aluminum flakes in it and is tougher than the black. The second most important thing, is to wear gloves. Once you get it on your skin it will only come off when that layer of skin decides to die and fall off, about a week or two... not too good when showing up for work!!

Unused POR15 can be transferred to a smaller sealable container to extend shelf life. However, the old wine lovers trick will work too. Get cheap glass marbles from a $ store and put them in the can to raise the level of the fluid. This assumes that there is at least 1/2 the can left.

That sealable container better not be plastic. For a while POR-15 was selling a set of 6 small plastic bottles with screw on tops, but they stoped because the plastic was allowing some moisture inside and drying out the POR-15.