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Old 07-23-2019, 09:05 AM   #1
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Smile About to paint - help!

Hi everyone,

My husband and I bought a 20 ft 2002 chevy school bus last month and are currently prepping the bus to paint this week. We have sanded the bus down, washed it with acetone and are now taping. We plan to paint on the primer this evening. Then paint two coats over the next two days. We will be spraying. We are slowly figuring this all out but also feel very overwhelmed by the amount we don't know!!

Couple of questions if anyone has some advice for us:

1. We are using a rustoleum protective enamel and planning to thin it with acetone. Do we also need to mix in a hardener? I have read differing opinions on this.
2. What ratio should we thin the acetone to the paint?
3. Do we need to wash/do anything between coats?
4. Rustoleum primer and paint both say to wait 24 hours between coats - is it necessary to wait 24 hours?
5. How thorough does the acetone wash need to be before priming?

Thanks everyone!
Sarah
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Old 07-23-2019, 09:56 AM   #2
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Quote:
Originally Posted by SarahNSam View Post
Hi everyone,

My husband and I bought a 20 ft 2002 chevy school bus last month and are currently prepping the bus to paint this week. We have sanded the bus down, washed it with acetone and are now taping. We plan to paint on the primer this evening. Then paint two coats over the next two days. We will be spraying. We are slowly figuring this all out but also feel very overwhelmed by the amount we don't know!!

Couple of questions if anyone has some advice for us:

1. We are using a rustoleum protective enamel and planning to thin it with acetone. Do we also need to mix in a hardener? I have read differing opinions on this.
2. What ratio should we thin the acetone to the paint?
3. Do we need to wash/do anything between coats?
4. Rustoleum primer and paint both say to wait 24 hours between coats - is it necessary to wait 24 hours?
5. How thorough does the acetone wash need to be before priming?

Thanks everyone!
Sarah
wiping it down thoroughly with acetone on a rag is ample - check the label on the paint can for the correct thinner to use - I've never come across a rust paint that required acetone to thin it, but that's not to say there isn't something new on the market - if it doesn't require acetone to thin it, it will create problems when applying the 2nd coat because acetone will soften the first coat on any rust paint I ever worked with - between coats it's best to give it a light sanding with fine grit sandpaper, then wipe the dust off with a dry cloth, followed by wiping with a 'Tac' cloth - if you add a bit of Japan dryers, or cobalt dryers to the paint, you can shorten that 24 hour drying time by a few hours - follow directions on the label for best results - what type of sprayer do you plan on using? ( I was a professional painter for most of my adult life )
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Old 07-23-2019, 09:58 AM   #3
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Originally Posted by SarahNSam View Post
Hi everyone,
Couple of questions if anyone has some advice for us:

1. We are using a rustoleum protective enamel and planning to thin it with acetone. Do we also need to mix in a hardener? I have read differing opinions on this. Hardener helps, my bus took about 2 months to fully harden, conditions were not optimal tho. my brother painted a trailer with the hardener and it was fully cured in less than a week. Get a good respirator (not a dust mask!) rated for the chemicals if you spray the hardener
2. What ratio should we thin the acetone to the paint? i mixed about 1 part acetone to 2 parts paint. easy to spray and smoothed nicely
3. Do we need to wash/do anything between coats?if you do not use hardener the paint will rub and peel easily so nothing is required.
4. Rustoleum primer and paint both say to wait 24 hours between coats - is it necessary to wait 24 hours? I did not use primer. Just the paint worked very well.
5. How thorough does the acetone wash need to be before priming? i sanded and wiped everything down pretty well. but it was basically a once over. Although any dust on the surface will limit how well the paint sticks...

Thanks everyone!
Sarah
Hopefully my answers help.
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Old 07-23-2019, 10:03 AM   #4
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I recommend getting a piece of metal and testing your sprayer to see how it sprays without thinning. The instructions on the can are:

"Before using, stir thoroughly to ensure any settled pigment is re-dispersed. If necessary, thin the material with acetone. For brush or roller, thinning is not normally required. For air spray, thin up to 15% with acetone. Do not thin with gasoline, lacquer thinner, turpentine, etc. For airless spray, thinning is not normally required. Apply with a good quality brush, roller or spray gun."

When we sprayed our bus, we found that we got better results when we thinned the paint.

We also used a hardener. Make sure you get one that works with the rustoleum.
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Old 07-23-2019, 10:04 AM   #5
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And the advice to get a mask is also very important with the hardener. Get a good one.
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Old 07-23-2019, 10:10 AM   #6
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Thanks all for the advice!

I think we will go with a hardener - I have read a lot of people use valspar - does this work with Rustoleum? Also, I am realizing that we bought the gloss protective enamel, but I don't think/not sure if it is the 'high performance' - is there a large difference?

I am not sure what kind of sprayer we are going to use. We are heading to Home Depot today to rent one....

Sleddgracer - sorry, can you clarify if you are saying to use or not to use acetone to thin?

Thanks everyone!
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Old 07-23-2019, 10:28 AM   #7
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Quote:
Originally Posted by SarahNSam View Post
Thanks all for the advice!

I think we will go with a hardener - I have read a lot of people use valspar - does this work with Rustoleum? Also, I am realizing that we bought the gloss protective enamel, but I don't think/not sure if it is the 'high performance' - is there a large difference?

I am not sure what kind of sprayer we are going to use. We are heading to Home Depot today to rent one....

Sleddgracer - sorry, can you clarify if you are saying to use or not to use acetone to thin?

Thanks everyone!
only if it recommends that on the label
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Old 07-23-2019, 10:53 AM   #8
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The brands don't really matter, you're just looking for a hardener that works with the type of paint you have. The valspar and majik hardeners both work with oil-based enamels, which the protective enamel and high performance rustoleum paints both are. I don't know the different between the two.
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Old 07-23-2019, 12:46 PM   #9
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Originally Posted by PigPen View Post
The brands don't really matter, you're just looking for a hardener that works with the type of paint you have. The valspar and majik hardeners both work with oil-based enamels, which the protective enamel and high performance rustoleum paints both are. I don't know the different between the two.
both of those brands of hardener will either be Japan Dryers, or Cobalt Dryers that someone has labeled as their own brand - if you have a choice between choosing Japan Dryers and Cobalt Dryers, Japan Dryers are more effective - DO NOT add more than recommended to the paint as it will create problems with the paint

https://en.wikipedia.org/wiki/Oil_drying_agent
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Old 07-23-2019, 01:06 PM   #10
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You should lightly scuff the surface and then clean. No hardener or thinner is required unless you're spraying. Then thin to the point it works in your sprayer. No prep needed between coats.

I painted right over the dirt with no prep and it looks fine. But the proper way to do it is above.
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