ospho with rust encapsulator

[crvtec90]

i have been using ospho ( green liquid like water) and i think its pretty good 4 rust removal if u can soak the part . there are a few places on the car that i sand blasted and applied the ospho over a year ago that have still not rusted.  i was wondering what u guys think about painting over it with the eastwwod rust encapsulator? it says to test 4 compatability. i took a small piece of sheet metal, sand blasted it, wiped it with laquer thinner, applied the ospho and let it dry overnight.  i did not get the funky white buildup and it looked good with that grayish color. i then wiped it again with laquer thinner after it was dry over night and applied a single coat of the rust encapsulator. i checked it the next morning and found that it did not lift and looked good but when i scraped on it with a small screwdriver it came off fairly easy. is this because i applied only one coat?  i am accustomed to using por-15 which dries hard as a rock. . i am trying to  move towards using the rust encapsulator over por-15 because i though it might be easier since u can spray it without special thinners. if i cant use the ospho to prep the metal i guess i have to order the eastwood fast etch.  i only bought the ospho because they have it in the local stores and i figured if i ran out i could just go get more instead of having to wait 4 the mail. thanx. tim

[flyboy01]

I would say no, RE only grabs onto rust, or existing paint and primer, it does not stick to bare clean metal very well. Ospho works very well and turns the rust into phasphate, the best thing to do is clean it (read the bottle) then spray and etching or epoxy primer over it. Personally I like etch because it forms a chemical bond, where epoxy forms a mechanical bond and the metal needs to have a sanded texture.

[crvtec90]

thanx flyboy. so last night i tried it again. i blasted a clean piece of sheet metal, wiped it down with laquer thinner and applied a more generous coat of re. i then waited an hour as per directions, and applied a second coat. this time it did not scratch off real easy yet it is not rock hard like the por-15. i also did a test piece on a rusty piece of steel and it seems the same. i think i will leave them outside 4 a while and see what happens. i noticed that u used re on the underside of your dart. did it dry real hard? i have a whole gallon of this stuff and would like to be able to use it. i imagine that if i blast the metal , clean it,  and do not use the ospho that it will give the bare metal good tooth to bond to. i have been to the eastwood forum and am finding lots of different opinions. i am on my back doing this in the garage and i dont believe i will be able to spray unless i get some of those spray bottles u fill and pressurize.

[Cpt Panzer]

ospho and other products like that need to have some rust to make the chemical reaction that converts the oxidation to a hard surface  I don't think they will work together.  also when ospho cures it is supose to be a primer. since it is acid based I believe ( but do not know ) that acid etch primers can be applied over it.

[crvtec90]

 when i dont use the ospho it still does not dry hard. i used a rusty piece of sheet metal and the paint sticks but it does not dry hard. i can use my fingernail to scratch the surface and scoop out a little chunk. it has more of a consistency of undercoat. semi solid . even the foam paint brush i used is dry, but pliable. i can still squeeze it down with my fingers. i have contacted eastwood and am waiting 4 a reply. right now i believe it is my jacksonville florida weather that is causing it. they say not to use it in high humidity. the por-15 still dries rock hard when it is humid but u get solvent pops like crazy. looks like a bunch of little air bubbles in the paint. i was trying to avoid that.

[Duster440]

RE won't get hard as a rock like POR but it will get a lot harder over time. It can take days or weeks to fully cure depending on how heavy you're putting it on. POR is known to fail when applied to rust free metal.

http://www.eastwoodco.com/jump.jsp?itemID=852&itemType=CATEGORY&path=1%2C3%2C688%2C821&KickerID=412&KICKER

[mshred]

has anyone ever used the rust primer from rust check...its a spray can primer thats supposed to stop rust and turn it into a paintable surface...anyone had any luck (or bad luck) with it?

[crvtec90]

has anyone ever used the rust primer from rust check...its a spray can primer thats supposed to stop rust and turn it into a paintable surface...anyone had any luck (or bad luck) with it?

i have not used that one. i did use one called " extend" that i was not very impressed with but u gotta try it and see if it works 4 u. i will say to try it somewhere other than the car or if u do use it on the car, make sure it is a place that u can easily work on if u find u dont like it. the guys at eastwood told me to give the rust encapsulator more time to harden. in high temp / high humidity it takes a lot longer to fully cure. i have a decent size wall mounted a/c unit in the back of my shop and i think i might try to use it to get conditions right.