I wetsanded the hood of my Camaro model about an hour ago. I got it very smooth, and then let it dry for an hour or more. I just sprayed it about 5 minutes ago, and the primer is already cracking. The cracking is raised cracks. I’m not sure why it is happeneing. The body which i did earlier this week turned out fine. Did I just not let the peice dry enough? Or is it something else?
HEY,
You may have sanded too early. Not sure though
Randy
Well, let me make this a litle more clear. I sprayed a primer coat on last night. Then, I wetsanded today around 2. And the I sprayed another primer coat on, and it is cracking. Should I have waited longer to sand?
HEY,
Dont think so. Dont know what to tell ya. Sry i couldnt help.
Randy
No problem mate, I think just another coat of primer and sanding and drying should fix it up.
Have you ONLY shot primer so far? Or have you shot paint over it? Two possiblities… it could be the primer reacting to the paint, or the paint reacting to the clear.
What clear are you using? Brand? Laquer or Enalmel?
What paint? Brand? Laquer or Enamel?
What primer?
If you only shot primer so far, it could be the residue on the plastic body. Kit manufacturers use a mold release to separate the plastic from the metal tools. This residue may react badly to some paints and primers. This can be remedied by soaking the kit parts in a tupperware box of water and detergent.
It could also be that you are spraying the primer on too thick. and each coat isn’t drying enough. How’s the humitity where you live?
Hope this helps.
Also could be that you didn’t let the hood dry long enough after wet sanding it, you might want to give it a good couple of hours for the primer coat and the plastic to thoroughly dry out, even the slightest bit of water will make it difficult for the paint to stick… and cause cracking…
Bah! release is the bane of good paint jobs… but using the above technique as robertburns suggested will help in getting rid of the release…
I do paint jobs in this order…
DRY Sand with a fine grit sand paper… Until the “shiny sheen is gone”
Wash the body with dish detergent and rinse
WET Sand with a finer grit sand paper
Let dry for a good 4 hours, sometimes over night…
Shoot your primer coat… Let sit over night…
Depending on how that primer coat came out, I will either Wet Sand again with an even finer sand paper and wait for another 4-8 hours… or I directly paint my final coat…
Make sure your rattle cans are thoroughly shaken before you paint… "Personally I would shake them for at least 5 minutes to ensure good mixture of paint inside the can…
The one secret I can tell you is that nothing should be rushed… patience and time are your best friends when it comes to a final finished paint job.
Start Spraying here><--------------MODEL-------------><Stop spraying here<
Rustyford hit on what I was thinking… primer is very porous and when you wet sand it, you have to let it dry COMPLETELY, otherwise you run into problems. After I wetsand anything, I let it dry overnight (if I’m in a rush)…a couple of days if I can take my time.