BLACK04WJ I will try to answer the best I can. I have used both products inside and outside including the plastic.
Q "Can I apply CS over a slightly rusted fender (dodge truck) and then apply ML over it?
A: Just remove the heavy rust and MEK clean
Q: "is there anything special i need to do to keep it from rusting further other that using the CS?"
A: Nope. The CS will attach to the rust and metal preventing it from rusting.
Q: "Also, Iím planning on using ML on my entire grand Cherokee for the body I need to scuff the paint and get rid of the clear coat correct?
A: Yup, just make sure to MEK
Q: "and then use white primer for the ML if I am using predator?"
A: Only if you want to lighten the color. I would have sprayed it with a color close to the ML as I had some light spots. I should have had two gallons
Q: " what about the plastic body panels and the bumpers.. how do I prep those for the best application? bumpers currently have herculiner and its ok but I really want the
A: For plastic check here http://www.monstaliner.com/documents...ng_Plastic.pdf
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If you are talking about the standard dark Jeep green I would think Jungle love would be the closest. The others are to light or blue.
I gallon was more than enough for the inside of my TJ.
The spec says up to like 80 or 85% humidity. I would make sure not to let the jeep sit in the sun. Maybe do it early morning or late night. It only takes an hour to cure enough to put a second coat on.
If you have a garage and access to even a small A/C unit it would help to lower the humidity.
For some reason they say to spray with water 8 hrs after, not sure why?
Hope this helps.