Dad's Valve Covers
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
I forgot one other thing ... Paint Thickness!
Obviously the thicker the slower!
-Enjoy
fh : )_~
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 39
From: EXTREME southwest CT
Wrinkles come from applying more solvent on top when only a skin has formed.
If it's more than an hour and less than cured all the way through, the half crosslinked paint tries to adsorb more solvent... but it cant flow so it distorts.
If it's more than an hour and less than cured all the way through, the half crosslinked paint tries to adsorb more solvent... but it cant flow so it distorts.
pedant
Joined: Jan 2008
Posts: 23,576
Likes: 39
From: EXTREME southwest CT
Oxygen has to diffuse through all of it to cure it
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FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Well, try to dig your thumbnail into it, wait longer if it's still soft. I don't know how heat will affect things but it's kind of like how epoxy glue cures... you know how there are different formulations e.g. 5-min or 4-hour epoxy which have nothing to do with any sort of "drying" process (where moisture dissipates) but how quickly a chemical transformation occurs.
Ha! Wouldn't know aaaaaannnnnnnnyyyyyyything about that.
Ya know, I like to think my mind still feels like I'm a teenager/20-something and I therefore subject my body to some of the same abuses I did as a kid, and I feel real strongly about exercise being good for you and helping ward off things like high blood pressure and heart disease.
But I'm being reminded recently about what it means to be 50 years old... for example the car radio stuff, how I migrated a 90s-gen JBL system into my mom's old mid-80s Tempo (Bill Vose's thread)... and that replaced this, this... this *thing* almost the size of a cigar box with an orange needle you controlled with a **** attached to a rubber band which adjusted this mechanical tuner device so you could receive radio stations.
And I had to think about that... man, show THAT to any of today's kids and they'll think it came from the 1800s!
And I consider it to be from an era of "not too long ago."
Jeeeeeeeeeez.....
Ha! Wouldn't know aaaaaannnnnnnnyyyyyyything about that.
Ya know, I like to think my mind still feels like I'm a teenager/20-something and I therefore subject my body to some of the same abuses I did as a kid, and I feel real strongly about exercise being good for you and helping ward off things like high blood pressure and heart disease.
But I'm being reminded recently about what it means to be 50 years old... for example the car radio stuff, how I migrated a 90s-gen JBL system into my mom's old mid-80s Tempo (Bill Vose's thread)... and that replaced this, this... this *thing* almost the size of a cigar box with an orange needle you controlled with a **** attached to a rubber band which adjusted this mechanical tuner device so you could receive radio stations.
And I had to think about that... man, show THAT to any of today's kids and they'll think it came from the 1800s!
And I consider it to be from an era of "not too long ago."
Jeeeeeeeeeez.....
Yes, tech is advancing rather rapidly these days. It is amazing what can be done with little bitty things any more.
As for youth, or the lack thereof, you still have a bit to learn. I still like to think I'm young, in spite of my almost 70 years, so sometimes try things I shouldn't. But, it does tend to keep me active, and that helps.
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FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Festus/Jim - So, tomorrow it'll be fine to heat it to 140 for several hours? I probably have 5 coats on it - 4 thin (2 primer and 2 finish) and 1 thick coat of the finish.
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
-Enjoy
fh : )_~
Methanoholic
Joined: Mar 2009
Posts: 6,442
Likes: 8
From: Maine (NorCal Native)
A lot depends on the paint ...
The coats you've done is nearly identical to what I do, I try to stick to two coats each, A good dusting of primer, then a good solid coat, a good dusting of top coat, then a good wet coat that flows for sheen (the trick is getting enough paint on without any flow indicators (ie runs)).
Then I let it air dry until it's tack free and you can handle it gently, I figure it's flowed all it's going to by that point, then I move it to the oven and do multiple short periods (30 minutes or so) with a good airing out in between.
Then if I want to sand it, I wait until I cannot dent it with my fingernail.
Depending on the paint, 1 to 10 days.
That's my success story and I'm sticking to it!
-Enjoy
fh : )_~
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Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
Gary, just send me your valve covers and I will place them in my truck bed. We are @ 100F [106+ heat index] and a hand held infrared thermometer indicated 150F when pointed at the black sprayed liner. I can give you hours at a time with no electricity costs! 
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FTE Legend
Joined: Jul 2010
Posts: 32,875
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From: Northeast, OK
We have the same temp and "feels like" here. Things get quite hot in the sun, but I like the controlled environment of the oven - no dust, no flies, and a known temp.
But, it was rather warm mowing yesterday!
But, it was rather warm mowing yesterday!
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FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
They've been in for 2 hours at 140. The paint was soft before I started and still seemingly as soft at 1 hour.
Working on the intake manifold and will need to bake it at 400 after while, so the valve covers may get booted out of the oven in a bit.
Working on the intake manifold and will need to bake it at 400 after while, so the valve covers may get booted out of the oven in a bit.
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FTE Legend
Joined: Jul 2010
Posts: 32,875
Likes: 48
From: Northeast, OK
Thanks. I did and the paint is still too soft to sand effectively. And that's after 2 hours at 140 degrees and 1 hour at 160 degrees. The intake is in the oven currently at 450 baking off all the impurities so I can PC it satin clear, but the valve covers need to go back in at a higher temp.