Model Boat Mayhem - Forum

Please login or register.

Login with username, password and session length.
Pages: [1]   Go Down

Author Topic: Spray paint crackling on application  (Read 1688 times)

TomHugill

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 530
  • Model Boat Mayhem is Great!
  • Location: Manchester
Spray paint crackling on application
« on: June 14, 2014, 10:10:57 AM »

Any ideas why this keeps happening:



Tried different spray paints, sanded it right back but no luck
Logged

TomHugill

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 530
  • Model Boat Mayhem is Great!
  • Location: Manchester
Re: Spray paint crackling on application
« Reply #1 on: June 14, 2014, 10:15:24 AM »

I should say the grey is tamiya surface primer, but I've tried white gloss enamel too with the same effect. The original primer was enamel white primer. The item in question is ply wood bit the details are plastic and suffer the same issue
Logged

rsm

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 1,399
  • Location: Manchester UK
Re: Spray paint crackling on application
« Reply #2 on: June 14, 2014, 01:05:33 PM »

Looks like your getting a reaction between the acrylic and enamel paints. I think you'll probably have to strip all the paint off very thoroughly and then re-paint.
Logged
Roger

regiment

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 1,697
  • Location: perranporth cornwall
Re: Spray paint crackling on application
« Reply #3 on: June 14, 2014, 01:35:16 PM »

 could be dirty finger marks 
Logged

Stavros

  • Guest
Re: Spray paint crackling on application
« Reply #4 on: June 14, 2014, 04:56:04 PM »

Defo a chemical reaction  due to different paints nothing else would have causd it....remedy.....strip and start again ...NO OTHER SOLUTION



Dave
Logged

TomHugill

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 530
  • Model Boat Mayhem is Great!
  • Location: Manchester
Re: Spray paint crackling on application
« Reply #5 on: June 14, 2014, 04:58:54 PM »

Well I managed to save it. Had to sand back the worst affected areas down to the original paint. Then slowly mist the tamiya primer in very light layers till it was sealed . Then white over the top. Seems to be ok!
Logged

rnli12

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 591
  • Location: Cornwall
Re: Spray paint crackling on application
« Reply #6 on: June 14, 2014, 05:03:51 PM »

Hi,
Normally if you spray acrylic onto enamel it will crack like this (chemicals or something) but not the other way around, i've just done the same after picking up the wrong spray tin! and after years of avoiding the same mistake.
 
OOOPS
Rich
Logged
Regards,

Rich

Umi_Ryuzuki

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 1,130
  • Location: PDX, OR USA
    • Models and Miniatures
Re: Spray paint crackling on application
« Reply #7 on: June 14, 2014, 09:03:21 PM »

If the tamiya paint is laquer or maybe some "dope" based thinner, you will get a reaction also.
However that is typically if you put the laquer over enamel, not the other way round.

As I understood it , Laquer, enamel, acrylic, in that order.  {:-{
If the undercoat is not fully cured, you could have the acrylic drying faster than the enamel underneath. As the under coat continues to dry, the top coat will crackle.

derekwarner

  • Full Mayhemer
  • *****
  • Offline Offline
  • Posts: 8,078
  • Location: Wollongong Australia
Re: Spray paint crackling on application
« Reply #8 on: June 15, 2014, 02:20:08 AM »

 %)...they use this effect intentionally on clay or ceramic pottery

Gold base coat...the a bone washed top coat that crackles showing the gold & provides an imitation antique look  <*<

Not my style........but have seen many examples......Derek
Logged
Derek Warner

Honorary Secretary [Retired]
Illawarra Live Steamers Co-op
Australia
www.ils.org.au
Pages: [1]   Go Up