Fluid film when sprayed on the inside panels tends to creep into cracks. This is a good thing but it can mean it actually creeps out the seams to the exterior of the van. Then it collects road dust. It wipes right off, no problem there.

I like that property of the he stuff, it makes me believe that the lanolin ( what fluid film mostly is) is coating all the hidden steel and rusty bits. Fluid film is pretty good at arresting rust, but it does get washed off with road spray. But in body cavities it sticks around.

Last week I sprayed the entire underbody with FF. Inside frame rails and all the nooks and crannies. I buy the stuff in 1 gallon containers and use a cheap undercoating gun and compressor to apply it. I do this once a year, while weather still warm and dry so the FF has lower viscosity and will do its creeping better.

Alistair

> On Sep 14, 2014, at 1:20 PM, Brett Ne <brettn777@GMAIL.COM> wrote:
> 
> Okay, okay, you guys have shamed me into doing the job more
> properly...Albert is going to get spoiled and start expecting me to do
> things the right way the first time on everything.  At least it sounds like
> I can put off doing the inside work until the dark months, when camping is
> less inviting.
> 
> So, I'm trying to figure out this oily stuff that you spray on the inside
> seam area.  I can see how it might infiltrate though the seam and stain the
> paint from underneath, but what is this  "will creep out and collect dust
> on the outside in places" about?.  The seam is covered with seam sealer,
> then primer, and then paint.  The only way it could "creep out" is if it
> breeches all 3 layers of shielding...well, two layers, as primer really
> doesn't shield from water.
> 
> What if, instead, the inside seam are is treated with a rust converter
> paint and then the entire panel and seam area is covered in a thick coating
> of bed-liner.  That should keep moisture out of the seam and provide some
> sound deadening.
> 
> 
> 
> --
> Brett in Portland, OR
> "Albert" '82 VanaFox I4 Riviera