POR 15 and paint

[erics667]

Hi,
I've looked but can't quite find an answer that makes sense.
I am working on the bed of my '74. It has good paint on 85% but primer and some rust on the rest and carpet glue on the wheel wells.
If I take the rust and carpet glue off, down to metal and seal with POR 15, can I and should I then just paint the entire bed?(<---This is the direction I'm leaning toward.)
Or should I just do the whole bed in POR 15? Then paint it?(<----Sounds expensive)
Can POR 15 be effectively used over good paint?
Or....?
Kind of lost with all the options honestly.
Thanks for the opinions and help!
Eric

 

[broncosbybart]

I would only use POR15 around the seams. It does not work well on clean bare metal. Epoxy primer and a quality top coat would be much better.

 

[NYLES]

Hey give John @ JAX a call, I saw him using a roll on stuff not long ago that smoothed out really nice, and I know he intended on painting over it because of the other places he was using it.

 

[tirewater]

If you use por15, you should use their tie coat primer before the top coat.

 

[Kurzhaarguy]

It is never a good idea to paint over existing paint. It is difficult to get good adhesion especially with really old paints. I would clean the metal up and see what you have. If you can clean up the old paint and still have some pitted metal I would use the POR metal prep followed by the POR 15. I believe the metal prep is a Phosphoric acid based metal prep, which have been used for years and are good at preventing underfilm coorsion. If you can get down to good metal with no pitting - it is hard to beat epoxy with a urethane topcoat. Either way make sure it is degreased as this is a sure thing you will have paint failure. POR 15 goes a long way. I would be willing to bet two small cans would do your job. Just my opinion.

 

[erics667]

Thanks everyone for the advice, I appreciate it.

 

[rydog1130]

I wouldn't use POR 15 on paint it will not stick well. Theres 2 ways it'll stick and that's painting on rust that been wire brushed so the loose scale is gone and treated with the phos/acid wash. The 2nd way is sandblasted bare metal that's been treated w/ the acid wash. It's also UV sensitive so if its going in your bed you'll need to top coat it

 

[CraigS]

Throw the POR out and scuff it all and apply automotive epoxy to rust proof the bare metal and seal down the old finish. Then refinish as desired.

 

[ntsqd]

Even sand blasted bare metal isn't ideal for POR-15. BT, DT. If I'm going to use POR I take to bare metal and let it flash rust before using their acid etch. I then top coat while it is still slightly tacky. If you don't do this be prepared to wait. As I recall something like a month per their instructions before scuffing it in prep for a top coat.