Basic questions before spraying

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Basic questions before spraying

Post by clhyer on April 11th 2010, 9:24 am

Good morning. Sure am happy to have found this site!
A little background on the project - it is a '72 Plymouth Duster that I have been working on for about 2 1/2 years now. Totally stripped down. I brushed the backsides of the fenders and underside with black and gray hammered rustoleum (I love that stuff!) and sprayed undercoating in the wheel wells and trunk pan area. I sprayed the interior, which all of it gets covered up, with regular rustoleum thinned with acetone, 2 coats of gloss white. Nearly all of the body work has been done, hoping to do the last door today! The plan is to apply two coats of rustoleum gloss white, two coats of gloss black accents and then 3 coats of clearcoat.

My questions:
1. My plans are to block out the hi build primer and wet sand with 320. Is there any benefit to be gained by wet sanding with finer grits?
2. The pieces that I have already sprayed (the undersides of the hood, trunk and engine bay) were sprayed with two coats. First coat one day, wait 24 hours and apply the second coat. Directions on the can I believe. In answer to another question on the site someone was spraying two topcoats of rustoleum with only a flash time between. Is this OK to do? Any special techniques to do this such as additional thinner?
3. I've also read of using laquer thinner instead of acetone as a thinner. Again, OK to do?

Probably have more questions before I get the job done,
Thanks again,
Cal Hyer
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Re: Basic questions before spraying

Post by retired plumber on April 11th 2010, 10:21 pm

Welcome clhyer
Glad you found us also.
To answer a couple of your questions......
1..320-360 grit is fine.
2.. If spraying all you need to wait is the tack (flash) time.
3..Laquer thinner WILL mess up rustoleum as will acetone. Some here have used acetone and swear by it but others swear at it. Mineral spirits is the proper thinner. Laquer thinner works fine to clean things up tho.
I'm sure others will be along to put in their opinion also. One thing to remember is there are no hard and fast rules for doing this Laughing
Sit back, read and enjoy.
Mike
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Re: Basic questions before spraying

Post by RoboGeek on April 12th 2010, 7:04 pm

my personal preference is 400 on primer, only because the primer is intended to cover scratches and stuff. I use the 320 before the primer, and 400 and higher after. I had some issues with 320 scratches showing when I used it on the primer. But all the coats of paint I used covered it ok
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Re: Basic questions before spraying

Post by clhyer on April 12th 2010, 9:53 pm

Thanks for the replies. Ret. Plumber, what could acetone do? The can calls for using it, I've used it so far every time I've sprayed and haven't seen any problems. I hate to start "looking" for problems, though, if you know what I mean... Do you know what the difference in drying time or mixing ratio is comparing the acetone to mineral spirits or any other differences?

RoboGeek, IIRC the data sheet with the 2K high build primer I use says that it will fill in up to 150 grit scratches. You might check the stuff you are using and see if you can't skip that last sanding. This is my second resto and I have always put 2K on after using 180G. That's also what I was taught in auto collision class.

This Duster is to be more of a daily driver so I was searching for cheaper paint without doing John Deere green & yellow!
Thanks again,
Cal
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Re: Basic questions before spraying

Post by retired plumber on April 12th 2010, 11:55 pm

I have not used rusto with acetone but others have and had a love/hate relationship with it. I think it is hotter than mineral spirits so it will dry faster and not allow the flow out needed. Since you are spraying that may not be a problem tho and I may have spoken out of place because most people here roll and that may be where the problem lays. I'm sorry if I goofed you up.

Mike
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Re: Basic questions before spraying

Post by clhyer on April 13th 2010, 9:53 pm

Mike,
You didn't goof me up. My prior spraying with rustoleum was to mix it with acetone 4:1; spray on one day the first coat and spray the second coat after 24 hours. So far it has gone very well. In addition to the interior I have previously done the undersides of the hood and trunk lid, the trunk and engine bay. None of these will get wet sanded prior to clear coat, probably just scuff the surfaces with a gray scotchbrite.
I am here to pick up any tips or techniques that might help with my project!
Cal
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Re: Basic questions before spraying

Post by RoboGeek on April 14th 2010, 4:12 pm

clhyer wrote:Thanks for the replies. Ret. Plumber, what could acetone do? The can calls for using it, I've used it so far every time I've sprayed and haven't seen any problems. I hate to start "looking" for problems, though, if you know what I mean... Do you know what the difference in drying time or mixing ratio is comparing the acetone to mineral spirits or any other differences?

RoboGeek, IIRC the data sheet with the 2K high build primer I use says that it will fill in up to 150 grit scratches. You might check the stuff you are using and see if you can't skip that last sanding. This is my second resto and I have always put 2K on after using 180G. That's also what I was taught in auto collision class.

This Duster is to be more of a daily driver so I was searching for cheaper paint without doing John Deere green & yellow!
Thanks again,
Cal

I meant after the primer was on. I actually covered 80g scratches pretty easily with it
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Re: Basic questions before spraying

Post by clhyer on April 14th 2010, 9:48 pm

Thanks for clearing that up. I've read most every post on the site, but can't see where anyone gives a clear answer on flash time when we are spraying rustoleum. The can says 24 hours. Some posters have alluded to 30 minutes or so, but do not exactly say what type of paint they were actually spraying. Has anyone sprayed multiple coats of rustoleum with only a flash time between coats? If so, what was your mixing ratio?
Thanks,
Cal
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Re: Basic questions before spraying

Post by retired plumber on April 14th 2010, 11:05 pm

To test for standard flash time with acrylic auto enamel touch the paint on some masking and when it is just barely tacky (sticky) to the touch your good to go again. This usually is anywhere from 10-25 minutes depending on temperature and humidity.

I would assume rusto is about the same as acrylic enamel and it would mix 3-4 paint to 1 reducer. I would always start at 3 to 1 and test. If I didn't like it I would thin it a bit more. That has worked for me for over 40 years of hobby painting. Never had a showcar job but they always looked a whole bunch better after I "worked my magic" lol.

Mike
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Re: Basic questions before spraying

Post by clhyer on April 15th 2010, 9:13 pm

Well, the moment of truth is rapidly approaching. I have been busting my butt all week and have the body blocked and wet sanded. I plan to tape it up tomorrow evening and shoot on Saturday.
Thanks for all the tips.
Cal
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Re: Basic questions before spraying

Post by RoboGeek on April 16th 2010, 6:11 pm

don't forget the pics!!
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Re: Basic questions before spraying

Post by clhyer on April 16th 2010, 10:00 pm

Will do, but it will be a while before I can do that...
Cal
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Re: Basic questions before spraying

Post by clhyer on April 20th 2010, 9:19 pm

How do I post a picture? Ready to give an update...
Thanks,
Cal
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Re: Basic questions before spraying

Post by RoboGeek on April 21st 2010, 5:50 pm

where do you have them hosted at?

its [img]picture-location[/im g], minus the space before the g
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Re: Basic questions before spraying

Post by clhyer on April 21st 2010, 9:56 pm

Mr. Geek, I'm sorry but "hosted at"? They are on my computer...
Cal
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Re: Basic questions before spraying

Post by JonChris on April 22nd 2010, 2:38 am

clhyer wrote:Mr. Geek, I'm sorry but "hosted at"? They are on my computer...
Cal

Imageshack is a decent place to host pics on the web.

http://imageshack.us/

Flickr if you want your photos to endure. Image shack likes to delete things after a while.

Flickr
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