Painting frames can be tough with all the angles and recesses. I heard one
recommendation to use two guns, a small touch up gun for hard to get at areas
though I never tried this method. I think you will find the topcoat runs easier
than primer. The trick is 3 or more coats with about 15 minute flash time
in-between. The first coat runs the easiest. Once you get a base built with two
or three tacky coats you can hang a thicker top coat that hopefully flows out
nice without running.
I don't know about Sherman William's paints but with PPG epoxy you can use
the same method, that is several coats with flash time in between. Also PPG
etching primer's directions say that if you get runs you are putting it on too
heavy which can adversely affect adhesion. Did you get directions with the SW
paint? With PPG you have to ask for the spec sheets. There is a lot of
important info on them. Also I was never fond of sanding if I didn't have to,
especially a frame. Epoxy primer does not sand well. Again I don't know about
SW but with PPG you don't need to sand if you re-coat within the specified time
of a week at 70 degrees.
When I did my frame I got it up about 4 feet in the air to easily get under
it and shoot everything at once. If don't do this you will have areas that will
show as overlapped in the top coat.
I had few runs in mine when all was done that observers were nice enough to
point out for me. I've never had anyone crawl under the finished truck and point
them out.
Grant
50 Chevy 3100
52 GMC 150
Deve Krehbiel wrote:
> Well, after spending a week on sanding, then noticing some imperfections in
> the frame welds that I had done and grinding them, then re-priming those
> areas (Its amazing what you can see after the green etch primer-filler is
> on) I put the first coat of black epoxy primer on today. I am also quite
> amazed at how different the different coatings are in their spreading
> characteristics. The green stuff I would have been better off coating it
> very lightly not even making the metal completely green the first time
> around.. while the epoxy primer went on thicker and turned the green color
> to black right away. Also, the green etch primer dried almost right away
> while the epoxy primer is still wet to the touch after 2 hours. In fact, its
> so wet, I decided to put the first coat on today and just put the second on
> tomorrow just to make sure its good and dry. I am not using seriously
> excessive primer as it is recommended to use a gallon and I have only used 2
> quarts so far (about 3 quarts with epoxy activator included). But if you
> disagree.. I agree that I am one of those guys that believe the "bigger the
> blob, the better the job" so I will just take longer in the sanding process.
> Tomorrow, I will flip the frame over and recoat it with another 2 quarts of
> epoxy and then spend until wednesday sanding the whole thing.
>
> In view of the different characteristics of the primers, what can I expect
> of the Urethane top coat? I still ran the heck out of the primer because
> this frame has so many channels and rivets and crap that dont allow a smooth
> coat, thus the need for a lot of sanding. I am not worried about what I have
> on so far cuz I can sand it, but the top coat WILL run the way I am doing
> this and I dont know how to stop it. I tried doing better this time and no
> change whatsoever. The stream is coming out vertical and sometimes I need a
> more horizontal stream which only works if the sprayer is full. What this
> means unless you guys have any tips is, I can run the crap out of the top
> coat and just live with it, or I can be more cautious and not have it cover
> ANY of the inside channels, around rivets and some of the ridiculously hard
> to get at places. Whats the trick?
>
> I am proud of myself nonetheless. It looks so good and I am fixing all
> mistakes as I make them. When you realize its a far far better job than
> Chevrolet did in 1950, it makes it all worth it. I never knew that frame
> could ever look this good. The satisfaction I am getting from this is
> comparable to last year when I aced the pilots exam. I tellya, its not all
> that half-bad being 40 something! :)
>
> Deve
> 50 3100
>
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
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