sup guys. I tried to revive an old thread, but no one was responding so i'll create a new one. Anyway so I have this rust that is forming on the rear left quarter panel where the rubber molding deal wraps around the edge. This area here is where the corrosion started I think. Anyhow it's starting to spread to the rest of the outter area of the 1/4 panel.

I don't have the resources right now to do a real fix (cutting/ welding). Does por-15 penetrate the rust and make it so I can bondo over it and sand it and still have it last a few years? Cuz even if I do rust a good amount of the rust from the edge of, i'll be left with almost no metal.

 

i can't weld, but i used fiberglass instead to do my repair.

tools (that i used):
Gloves
Mask (cover nose and mouth from fumes)
Wide paintbrush
Angle grinder
Fiberglass kit
Fiberglass Mat also known as Chopped Strand Mat
Sandpaper different grits and wetsandpapaer as well
Black Primer
Autopaint
Painters tape
Old newspapers
Liquid Canuba Wax
Sponge
Sheet Metal (thin enough than you can bend with your hand)
Sheet metal Scissors

you also should consider:
A free weekend (to work on car, and let fiberglass and paint dry)
Warm/ Hot weather (helps adhesion and drying time)

1. remove wheel put on jack stand
2. remove rust with angle grinder, sand an extra one inch around what you cut off
3. cut large enough portion of sheet metal to bend a mold (by hand)of the lower edge which attaches to the rear bumper -basically you are making a mold of part you just chopped off in step 2
4. mask off pieces on your car you don't want fiberglassed
5. use sponge and wipe liquid wax in sheet metal mold
6. cut some pieces of cloth and mat to fit in mold
*put on gloves and mask
7. mix and pour small amount of resin and hardner from fiberglass kit, into mold
8. add cloth and mat to mold, build up as many layer as you like for strength
9. let dry, pull out from mold
10. cut some pieces of mat (for inner wheel well)
11. cut some cloth for outer wheel well
12. mix resin and hardner small amount
13. apply resin, apply cloth/mat, apply resin over top build up for strength
14. let dry
15. test fit , add more resin if necessary(additional drying time)
16. drill pilot hole for bumper bolt
17. test fit
18. sand and paint let dry over night
19. clearcoat
20. let dry, reassemble

here's another link for a similar way to use fiberglass:

http://www.nicoclub.com/articles.php?id=168601

just one way to fix, hope this helps

 

any pics of the job u did? thanks for the post