Cracking in primer

[Hazza]

What does it mean when i spray primer onto something, and when it starts to dry, there's cracks etc.

What have i done wrong?

Cheers

 

[Lou]

Not smoothed it enough??
Thats just a guess!

 

[Hazza]

I checked it before i primered it, and it looked and felt smooth tho

 

[JON13S]

could be the wrong type of primer for the material you are spraying on to

 

[-J-]

The Surface is not clean your spraying onto, Try flatting it back then wiping it off with some panel wipes before painting.

 

[Hazza]

Grey Plastic Primer on side badges for the car..

 

[Hazza]

Panel Wipes? I'm assuming alcohol based ones?... could i just use a cloth and put some vodka onto it? lol would that work?

 

[Fred@BTM]

no, you need proper solvent

 

[Benbosh]

Would acetone be too harsh? Like nail varnish remover??

 

[Jungle_Jim]

the cracking occurs if you havent keyed the surface as the primer cannot stick to it mate, you need to take some fine sand paper (800 grit) and rub up the surface. by putting tiny scratches in it the primer can bond to it, they will then disappear when applying a second coat, apply three coats of primer overall and then lightly sand with 1200 grit before applying paint

 

[kic]

i think the area is TOO smoothe, try roughing it up a bit more with some lower grade wet & dry, also could be spraying too close, putting it on too wet / thick. can not shaked well, just guessing now lol

 

[Gaz_]

Get some pics up, might help. I'd go for surface contamination or sprayed on too thick tbh......

 

[fUbAr]

rough the surface up, and make sure the primer is at room temp and well shaken. Continue to shake the can while spraying.

 

[Final Maxim]

could be loads of reasons

id guess at putting it on too wet

 

[Michael172]

i think the area is TOO smoothe, try roughing it up a bit more with some lower grade wet & dry, also could be spraying too close, putting it on too wet / thick. can not shaked well, just guessing now lol

exactly. you need to give it somehting to key to. get some 1200 grit and sand it.

 

[pete_clio]

when i did mine i just keyed the badge with scotchbrite and sprayed the colour straight on. worked alright, no problems