Bad filler or bad mixing?

[AmadeusCharger500]

My 73 charger recieved a new quarter panel and I was using evercoat lightweight filler to smooth the welds and a few waves in the panel. I primered the panel then I put filler along the entire weld which surrounds the quarter panel. It has sat for 2 days and now that I go to sand it the paper is getting so clogged I'm realizing it does not seem fully hardened. Does not sand the way I'm used to.

2 thoughts.
I mixed too little hardener?
Filler has sat on the shelf for almost 2 years could it be bad?

Biggest and last question is how do I get this gunk off my new quarter panel. Am I looking at scraping with a puddy knife, laquer thinner, clogging and wasting several discs and packs of paper? Repriming?
Is there an easier way to get this off, and or is there one little slight chance it will harden more if I let it sit in the sun.

[stevethegray]

I get these things from wal-mart

http://www.walmart.com/ip/3M-Paint-And-Rust-Stripper-7771NA-CC/17300525

They grind right through body filler, and paint.

[Dino]

Not enough hardener or too mcuh hardener gives you the same result, it won't cure.  2 years is too old unless you had it stored airtight and then still.  Also look for the production date, it may have sat on a shelf for a year before you got it.

Scrape it off with a good putty knife and sand down what's left.  Make sure it's all gone, especially in the pinholes of the welds.  Use a wire brush, or the one Steve posted, on the weld to be sure.  You can't put filler over uncured anything without asking for trouble.

[b5blue]

Paint stripper may work. @ 2 years old it's junk pitch it!

[AmadeusCharger500]

I'm getting most of it off with 36 grit paper. I'll get into those welds with a minidisc on the diegrinder or use that paint stripping tool, which I got laying around somewhere.

I'm throwing away whats left of the filler. Whats the opinion on the product I'm using? I'm gonna pick up more filler tomorrow.

[b5blue]

I'm using Evercoat! Good stuff, even the cheaper stuff works well. (I'm getting ready to try Quantum 1 also.)