Painting Interior Roof Sections

[john108]

I don't know if the following question should be here or placed in the Interior section??

The interior metal roof had some rust.  I sanded the 3 "flat" areas with a sanding disk attached to a grinder. 
The automotive paint supply that I went to suggested painting the metal with POR-15.  I also called POR-15 and was told that things won't stick to POR-15 unless it is well sanded.
I just painted the roof exterior with POR-15, where the replacement vinyl roof will be installed.  It has been less than a full day and the POR-15 doesn't sand well (probably not fully cured and is too soft now).
My Question here is:  Should I paint the 3 interiot "flat" areas with NAPA's Zinc-Rich Primer or POR-15 or Epoxy Primer or .
John

[Charger-Bodie]

unless the metal is spotless clean the por-15 is the best bet . do you plan on paint the inner roof skin or are you asking that part more about the ext. of the roof?

[john108]

1-hot68:  Just protecting the interior metal skin, which will be covered by the headliner.
John

[Charger-Bodie]

1-hot68:  Just protecting the interior metal skin, which will be covered by the headliner.
John

John, in that case id go with the POR-15 or any rust encapsulator.

[hemihead]

1-hot68:  Just protecting the interior metal skin, which will be covered by the headliner.
John

Did that to mine

[bill440rt]

1-hot68:  Just protecting the interior metal skin, which will be covered by the headliner.
John

Did that to mine

Me too! POR-15 on the inside, PPG DP epoxy on the outside.

[Shakey]

I don't know if the following question should be here or placed in the Interior section??

The interior metal roof had some rust.  I sanded the 3 "flat" areas with a sanding disk attached to a grinder. 
The automotive paint supply that I went to suggested painting the metal with POR-15.  I also called POR-15 and was told that things won't stick to POR-15 unless it is well sanded.
I just painted the roof exterior with POR-15, where the replacement vinyl roof will be installed.  It has been less than a full day and the POR-15 doesn't sand well (probably not fully cured and is too soft now).
My Question here is:  Should I paint the 3 interiot "flat" areas with NAPA's Zinc-Rich Primer or POR-15 or Epoxy Primer or .
John

I covered mine with red oxide primer so the Lizard Skin would stick to it.  I had to do some sanding to remove the glue that held the original insulation up there and to scuff it so the primer would apply nicely, other than that, pretty straightforward.

[gasoline_24]

Have you already applied the lizard skin?  What did you think of it?  I am thinking of shooting the entire passenger compartment with Lizard skin, but didn't know how it went on or if it was better than dynamat. 

[Shakey]

Have you already applied the lizard skin?  What did you think of it?  I am thinking of shooting the entire passenger compartment with Lizard skin, but didn't know how it went on or if it was better than dynamat. 

If you utilize the advanced search feature using key words like interior insulation with my username in either the paint and body or interior sections, you should find a thread where I posted some photos of the application.

[john108]

I have already hand painted the interior roof area with POR-15.  I know I will need to sand it well for anything to stick to it.
John

[bill440rt]

I have already hand painted the interior roof area with POR-15.  I know I will need to sand it well for anything to stick to it.
John

No you won't John. POR-15 makes 2 different primers designed to go directly over cured POR-15 for topcoating without sanding. You can use either their Self-Etching Primer or Tie-Coat Primer.

http://www.por15.com/products.asp?dept=3

I used their Self-Etching Primer when I painted the undercarriage on the '69 I'm building, & also on other small parts. It worked great, & the stuff sticks like glue.

[john108]

Bill
To glue the insulation to the underside of the roof, I wasn't planning on using primer.  Just sand it and glue the insulation with 3M spray adhesive.
John

[bill440rt]

You don't need to sand it for the glue to stick either, John.   
Just use 3M's Super-Trim Adhesive in a spray can. Give a coat or 2 each to the roof & the insulation, let it tack up for a minute or 2, then press the insulation to the roof. It will stick.

[john108]

Bill - When I phoned POR-15, the guy I spoke to said that NOTHING will stick to POR-15, after it has cured, unless you sand it to break the shine.  Even if you want to coat POR-15 over POR-15.  If it hasn't fully dried yet, than you can apply a second coat.  For Safety, I plan on sanding slightly and then follow your recommendation.
John

[Shakey]

Sanding may be the wrong term being thrown around.  Scuffing would be more appropriate.  True?

[john108]

True, Break the shine