The Straight Dope

Go Back   Straight Dope Message Board > Main > General Questions

Reply
 
Thread Tools Display Modes
  #1  
Old 07-07-2005, 01:21 PM
Cagey Drifter Cagey Drifter is offline
Guest
 
Join Date: Apr 2005
Will acrylic paint melt if heat is applied?

Uh, yeah... this is probably a stupid question, but if I iron a surface covered in acrylic paint, will it melt? Which kinds of paint won't smear, smudge, melt, or otherwise become "wet" if high heat is applied?
Reply With Quote
Advertisements  
  #2  
Old 07-07-2005, 03:24 PM
Padeye Padeye is offline
Member
 
Join Date: Nov 1999
Location: Phoenix, AZ, US
Posts: 7,672
You really need to be more specific about how much heat. Most paints will not become wet but they may soften, burn or peel. Without any othe rinfo I suggest trying enamel paint made for automotive header pipes but it all depends on what you are painting.
Reply With Quote
  #3  
Old 07-07-2005, 03:45 PM
Cagey Drifter Cagey Drifter is offline
Guest
 
Join Date: Apr 2005
Applying an iron on its hottest setting to a wooden plank with spray-on acrylic paint. Would that melt it?
Reply With Quote
  #4  
Old 07-07-2005, 07:16 PM
MaryEFoo MaryEFoo is offline
Guest
 
Join Date: Dec 2002
Don't know, but I'd give big odds it would.

Test: fingernail polish is mostly acrylic these days, and you could use some to test--easy, since it dries in minutes.

I'd put a paper towel between the acrylic and the hot iron, though, and be prepared to scrub at the iron with more towel.

Hottest setting on my iron is for linen, next cooler cotton, next cooler wool, next is rayon & polyester, next is nylon & silk, and last and coolest is acetate &, guess what, acrylic.
Reply With Quote
  #5  
Old 07-07-2005, 11:11 PM
Miss Purl McKnittington Miss Purl McKnittington is offline
Guest
 
Join Date: Apr 2002
There are fabric paints that are set with heat. Scroll way down to "Heat-Setting." I believe they call for lower heat settings -- more along the acrylic (go figure) setting than the linen setting.

I seem to remember that tossing clothing that had artists' acrylics on it in the dryer made it impossible to remove the paint. I don't know if it's because the paint melted, but it definitely didn't come off.

What are you thinking of ironing?
Reply With Quote
  #6  
Old 07-07-2005, 11:22 PM
Cagey Drifter Cagey Drifter is offline
Guest
 
Join Date: Apr 2005
Basic story is that I'm trying to put computer art onto canvases, wood, etc... The surfaces I'm trying to put them on are painted. I read recently that you can iron laser printed pages onto surfaces to transfer them. I'm not sure if this is true; I tried it once, and part of the image indeed transferred, but most of it didn't.

Summary: I have no idea what I'm doing.
Reply With Quote
  #7  
Old 07-08-2005, 12:47 AM
picunurse picunurse is offline
Member
 
Join Date: Mar 2003
Location: Seattle
Posts: 11,427
Why not just do a test before trying the actual transfer?
If your laser prints don't work think about getting some of the commercially available tee shirt transfer sheets that you can print images from your computer. The ones I've used worked great. They were for ink-jet, however.
Reply With Quote
  #8  
Old 07-09-2005, 11:05 PM
Napier Napier is online now
Charter Member
 
Join Date: Jan 2001
Location: Mid Atlantic, USA
Posts: 7,908
I think paints differ regarding whether there is any kind of crosslinking that happens during or after drying. If there is a polymer in solution to provide a base for the paint, they can add agents that crosslink the long polymer molecules - meaning that various points on one chain will form chemical bonds with neighboring chains. This makes the paint more durable in ways, including no longer being soluble in whatever used to dissolve it, and including not melting (but rather decomposing into smoke and ash at some higher temperature).

They can make this happen by including all the ingredients for crosslinking in the paint, then adding a component that inhibits the crosslinking process. This component would evaporate or otherwise get disarmed once the paint is applied.

I am going to guess that you can test whether the paint will melt by testing whether a solvent like acetone dissolves it. Bear in mind that the crosslinking may take several times longer than the drying does, or maybe even days.
Reply With Quote
  #9  
Old 07-10-2005, 02:33 PM
spingears spingears is offline
Guest
 
Join Date: Jul 2003
Quote:
Originally Posted by Cagey Drifter
Uh, yeah... this is probably a stupid question, but if I iron a surface covered in acrylic paint, will it melt? Which kinds of paint won't smear, smudge, melt, or otherwise become "wet" if high heat is applied?
First "Stupid Question" Try it and see for yourself.
Most paints wil smoke, scorch, and char.

Second ?: Flue or smoke pipe paint, stove polish and similar products are made to withstand high temperatures.
Some aluminum based paint/coatings also withstand high temperatures.
__________________
Do nothing simply if a way can be found to make it complex and wonderful
spingears
Reply With Quote
  #10  
Old 07-11-2005, 03:48 AM
scm1001 scm1001 is offline
Guest
 
Join Date: Jun 2001
polymer chemist checking in:

[Nit pick] most acrylic polymers do not have a true melting point. They have a "softening point" or Tg (which needs to be above room temperature otherwise they will feel sticky). But for the layman, most acrylics will get very soft on heating, and "appear" to melt. Only highly ordered systems (e.g. crystals) actually melt.

So if your paint is water based acrylic it should work, though heat can damage or change the coloured dyes or pigments, especially in cheaper paints

Oil based paints on the other hands need much higher temperatures to soften as they are highly cross-linked, and so need much higher temperatures (and fierce looking heat guns if you are a repainter) to soften.
Reply With Quote
Reply



Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 09:09 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.

Send questions for Cecil Adams to: cecil@chicagoreader.com

Send comments about this website to: webmaster@straightdope.com

Terms of Use / Privacy Policy

Advertise on the Straight Dope!
(Your direct line to thousands of the smartest, hippest people on the planet, plus a few total dipsticks.)

Publishers - interested in subscribing to the Straight Dope?
Write to: sdsubscriptions@chicagoreader.com.

Copyright 2013 Sun-Times Media, LLC.