Yes, I know you can add a pile of hardener and get it to kick in a few minutes. This also gives better mechanical adhesion for the filler. There so many good fillers, primers, glazes, and paints that are two-part systems today. It needs to be at 64 degrees Fahrenheit minimum to cure, and the best is between 72 and 80 degrees Fahrenheit.
Most primers have some alcohol in the solvents which will help draw some moisture Filler paper. A good cure time lets the gasses come out, and gives ample time to work out the air pockets with the spreader, eliminating pinholes.
There is a health concern with chromate-based products and we are starting to see chromate-free products. If you try to fill holes in a body panel, moisture can be absorbed from the back side, causing the area to swell and bubble.
Reed used to work as a technical sales rep for the company that makes Rage filler, and knows the chemists that developed the resin for it. When working on a rusty, old car, to get it down to bare metal, I plastic media blast if possible or carefully sandblast at low pressureand then grind just prior to doing the body filler work.
Self-etching primers acid-based reducer types like Variprime are still soluble and can absorb thinner or solvents. Thick layers, like multiple coats, can act like a sponge to soak solvents which can remain until after the filler cures, possibly causing problems later on as they try to escape.
They used to say, "This car has 20 coats of hand-rubbed lacquer. An even cure temperature until full cure is reached will also help with expelling solvents and humidity from the filler as it cures.
I would suggest letting the body be warm and dry for a few days before priming to help let any moisture that may have absorbed into the bare filler areas evaporate. These are high-dollar, top-of-the-line products. It's a lot less messy than using metal prep and you get a good chemical and mechanical bond.
That is one of the causes for rust under the filler. Etch primers contain an acid usually phosphoric acid and chemically etch the metal the acid converts the iron oxide, meaning rust, to iron phosphate and the filler part of the etch primer seals out the moisture.
If used as a rust inhibitor read the tech sheet to see the mills thickness per coat. This helps the mechanical adhesion of the filler to the metal. It starts crystallizing over degrees Fahrenheit.
Remember, this needs to work with the temperature of the air and metal. When spreading the first batch of filler to the bare metal, extra pressure should be used to force the material into the metal as thoroughly as possible.
For resistance to moisture both the type of resin and the amount of solids filler material in the type of primer are factors.
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