Paint Preserver

[RG67BEAST]

I just got done spraying 25 year old ppg dp40 primer. This stuff is supposed to have a shelf life of a year unopened, a month opened and the catalyst far less.
Before sealing the containers years ago I held a propane torch above the containers and opened the valve so the gas drops into the containers effectively forcing the air up and out of the containers. Propane is heavier than air. Air is what will shorten the shelf life of any paint.
This works with auto or house paint. The paint will be as fresh as when you opened it. Infact if there is no wind in the room you don't even need a lid on the container. Argon gas will do the same as it is also heavier than air.
Ray

[DaWildcat]

I'd be interested in seeing the results of an adhesion test after it's cured. Basically you cross hatch an area that's been sprayed with a razor blade and then attempt to lift off the coating with adhesive tape. Another test would be to wipe the cured surface with laquer thinner. If imporperly cured, you'll be picking it up in the cloth.

Devon

[RG67BEAST]

Yes I used to do newton tests. That would be a great idea.
This is going under a vinyl top on my car. In a scrape test down to blasted metal the old dp40 adhered best no question. Then the fibertech filler then the brand new dp40lf.
I experimented for 2 weeks as there is too much conflicting info on the net so I did tests myself.
Laquer thinner if left long enough with wiping motion and sopping rag would take them all off. Not easily but would eventually break them down even after being cured for a week.
Ray

[DaWildcat]

I think PPG's DP40 is the best thing since sliced bread. I always put it over any bare metal; awesome base for all topcoats including filler.

Devon