Mike phillips..school me on painting

[chemguy626]

This weekend I will be painting my aunts 2001 volvo s40. The car has clear coat failure. I will be painting it a single stage metallic.
My question is about color sanding after I paint it. How long after I paint it should I wait(this will be painted in a garage) to color sand and polish it? What about sealing it afterwards? Is there any other pointers you can give me? I am excellent at the prep and im an ok painter(i took painting and refinishing in college).

Thanks for your time

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[Skimmer0220]

Check your data sheets there'll be something on there about how long it will take till you can sand


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[BobbyG]

If you're using lets say DuPont Centari enamel I'd advise using their DuPont 793S Acrylic Enamel Hardener.. This is a chemical hardener designed as a catalyst to chemically harden and cure the paint in 24 hours.

1 PINT 793S ACRYLIC ENAMEL HARDENER CENTARI DUPONT

http://www2.dupont.com/Coating_Solut...opcoat_A_E.pdf

DuPont Centari Enamel Application

• Apply three full wet coats. No additional flash time is required. If a mist-coat is required for metallic colors, mist coat while coating is still wet.
• In case of fish eyes, add up to 1 oz. of DuPont™ 259S™ Additive per RTS gallon.
• Add up to 15% DuPont™ Centari® Topcoat mixing enamel for tinting purposes.
• If clear-coating, allow topcoat to cure overnight before applying ChromaClear® 7900S™ Multi-Use Urethane or ChromaClear® 7779S™ Multi-Mix™ Clear coats. Follow clear coat recommendations for activation and application.
• DuPont™ Centari® Topcoat can be clear-coated up to 48 hours after the final coat without the need to sand.

• 77°F (25°C) & 50% Rh at recommended film thickness
• With DuPont™ 793S™
  Tack Free 1-2 hrs
  Tape Free 4 hrs

Wet sand after 48 hours..

[chemguy626]

what about polishing and sealing after that?

[DaveT435]

I assume you know to get as much dust out of there as you can and wet the floor to keep dust down...

[Mike.Phillips@Autogeek]

Originally Posted by Skimmer0220

Check your data sheets there'll be something on there about how long it will take till you can sand.

Good advice.

The paint shop where you buy your paint should also be able to give you some directions for your specific geographical location too if there are any extremes in your weather/temperatures.

Originally Posted by BobbyG

Wet sand after 48 hours..

Thanks Bobby for looking that up.


A good rule of thumb for most paint systems in most geographical locations is to wait for about 3 days but get on it before a week or two passes.

I have a 1965 Comet Convertible coming up to do a full wetsand cut and buff, I'll document as much of it as I can for an article.

[Mike.Phillips@Autogeek]

Originally Posted by chemguy626

what about polishing and sealing after that?

Sanding, compounding and polishing are one process.

I would recommend using the best sanding papers you can obtain and finish out at least 2000 grit. Higher if you can get it. My personal preference is to machine dampsand but you can hand sand too..

Then have a high quality wool cutting pad and a rotary buffer and a good compound ready to cut out your sanding marks. Machine polish with foam pads and then stop until around 30 days pass.

Then seal the paint with a car wax, synthetic paint sealant or paint coating.


Pictures?

[Mike.Phillips@Autogeek]

Originally Posted by DaveT435

I assume you know to get as much dust out of there as you can and wet the floor to keep dust down...

I've used plastic drop cloths to build a paint booth inside my garage and then use some large box fans to extract air.


Not a perfect approach but a lot of guys have done it like this and it does help to create a cleaner environment plus also keeps overspray off everything in your garage. If you don't want overspray dust on something... cover it.

[DaveT435]

Originally Posted by Mike.Phillips@Autogeek

I've used plastic drop cloths to build a paint booth inside my garage and then use some large box fans to extract air.


Not a perfect approach but a lot of guys have done it like this and it does help to create a cleaner environment plus also keeps overspray off everything in your garage. If you don't want overspray dust on something... cover it.

Anything to keep dust out of the paint....and overspray is never any fun. Great idea!!

[chemguy626]

the guy from the paint store said you cant wetsand single stage metallic beacause you will disturb the metallic. Is this true? Any pointer on this? I just dont want ANY orange peel.

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