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Painting cowl area???

Since no-one else has, I'll bite. If the fenders are off, you can use a cheap garden sprayer... I took some brake line & rigged it to fit the hose in place of the wand & nozzle, and long enough to reach a little beter than halfway in the cowl. Peen the end of the tubing to close it off, and just upstream of the peened end cut a slot with a hacksaw. It will make a passable fan pattern.
Do not, however, do like I did and get in a hurry to try it on the car-you won't be happy. Practice a bit with vicosity and the speed you move the thing and it should come out Ok.
If the fenders aren't off, you may be able to do the same thing through the slots, but it will be much more difficult.
 
I, not being as smart as Dennis, hadn't figured out how to get paint in there...

My cowl area had surface rust with no thru penetration luckily so I attacked it from every opening as I had my fenders off and htr/drivers vent out. I used Eastwood rust converter and a bag of flux brushes (thin metal handle short hair brushes you use to spread soldering flux, bought at HD in the solder section -$3/bag?). These thin brushes allowed me to slip them through the vents and brush on the converter liquid. You can put blue painters tape on the 2 ribs you'll be going between to keep from getting it on your outside vents paint. I went between the vents in 4 places and this allowed me to brush most of the area but not the underside of the vent ribs themselves.
I also crimped the brushes onto long screwdrivers to give me more reach when working from the drain areas under the fenders to get the hats covered. I also bent the brushes at a ~180* to work from inside the car through the hats. Other than the underside of the ribs themselves I got good coverage. I'm hoping my painter will have a wand or good solution to get paint in there when the cars painted but at least I put the rust at a standstill for a time and sealed it.
Jon
 
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