Hey guys, I tried to paint my front lip first sanding it down with 400grit, then 2 coats of PLASTIC PRIMER, then wetsanding with 600grit, then applying 2 coats of spray paint, then 2 coats of clear.
What happens is, when i spray the color paint onto the primer, the paint begins to start wrinkling badly, it's so horrible!!! I fully sanded it down again and the same thing happened.


Do you guys think the PLASTIC PRIMER is the problem and it's not holdingup to the paint?? Any corrections to this problem, and the right materials and paint to use? Thanks for any help

 

that's weird, I've had no problems before with plastic primer (although I need to wet sand still) but I did notice before that if it's too cold, it'll cause problems. If you're doing it in your garage, use a space heater or something

 

the only reason i could think this would be happening is if you are not waiting between the primer coat and the paint coat.

try doing this:

do the primer coat and then wait for like 30 mins or so and then try painting....i usually apply the primer and then go inside do my thing for abt an 1 hr..that gives it all the time it needs to dry up and settle on the surface.

do show pics that would help....

 

what are you washing down the primer with before applying the paint??

 

hmm...adhesion problem.

Better to paint +16c ....temperature might be your problem as someone mentioned.

Other things to look for would be surface prep,
-make sure its clean...wipe down with hot soapy water...
-primer is fully cured
-if its a new lip it may still be gassing off...they usually have a mold release agent. In that case sand again and leave out in the sun for a day or 2.
-Or you can try an adhesion promoter...either 3M or SEM they're pretty good, haven't had any problems with them.

 

have a pic of the crackling or peeling, i had alot of problems when doing paintign in cold temp, not sure if it the same thing thats happening.

 

I actually primed it in the morning and after apprx 5hours letting the primer cure, I wet sanded it lightly, dried it off completely then painted it. Now that I remember!!!! The primer DID feel soft after I wet sanded it, could it be that when this primer get wet with water, it turns wet again??!!! Wierd It did feel dry before, but after wetsanding it feels like the primer softens unlike when it's dry and cured which it already was before i wet sanded.

 

Pure water and soap

 

You know what? I think it may the primer getting softened after i wet sand it, then dry it off. Even when i completly dry it off it still feels a little soft to the touch. Maybe I should wetsand it, but wiat a couple hours for the primer to harden again. It's wierd I never had such experience with primer, yet 1st time using PLASTIC primer.

It has been waiting a couple days even a week before i painted it, and it was around 16-20c when it was painted. I have been thinking of using adhesion promoter. Is this to use instead of the primer? Should i first use adheasion promoter, then paint it?

 

what lip? aftermarket or stock? also why are you wet sanding the primer?
with the wrinking of the paint when its applied it is either not agreeing with the primer or its too cold. you can also tell it was handled alot and not washed properly.

now best to have a little bucket with warm tap water and have the cans of primer and paint sit in it for approx 10 - 15 mins. helps the particles in the paint gather ( i know this sounds stupid) but the paint particles dont cling in the cold ( kinda like tape when its cold).

while doing this you can be prepping the lip with the 400 grit paper. after the 10 - 15 mins is up apply dust coats of primer almost as if you can see it dry after each coat. apply as many coats as it takes to cover the lip. after this is done keep the lip inside if possible till dry then apply light coats of paint. then same procedure with the clear but a little bit heavier with the coats ( not soaking wet so it runs).

then your best bet is to wait 24 hours and wet sand the clear coat, and polish with a coat of wax. Never fails.

but yes i find that the cans sitting in the warm water for a while actually helps out alot with the adhesion, and also run to crappy tire and grab a can of the Duplicolor wax / grease remover (prep wash) and give the lip a wipe before you start with the primer.


good luck.
hope that helps a bit.

 

i would bet its to cold as alot of other ppl mentioned. Paint does not like cold.

 

It is an aftermarket Type-R style lip, i wet-sanded it to make it smooth for the paint finish. I will take your advice with the warm water bucket thanks! Any more advice on how to use the adheasion promoter?

 

well the wet sanding of the lip before primer is not to good of an idea as you just create the surface to be too smooth for anything to adhere to the surface.

best is to do is stated above. as the primer covers light sand scratches and will give the paint somthing to stick to too (after light ly scuffed 400 grit or little softer).

hope it helps you.

post pics of finished product.



Good luck.

 

I actually wetsanded after I primed the lip, not that it matter it makes sence about not making the surface too smooth, cool.

I will take your advice about lightly scuffing with 400, or even 600grit before i paint it. I FOR SURE will take pics of the finished product.

 

is this a new aftermarket lip or a used one that was previously painted?

if it was previously painted before thats why your paint is wrinkling.

you cannot apply plastic primer or adhesion promoter to any surface that has previous paint on it without completely sanding it down to its bare plastic.

also i wouldnt use 400 grit sandpaper on those front lip's. its too rough use 600 (it will take forever but its the best) 400 is to coarse and it will cause it to fur up and thats another reason.

btw dont you work at a bodyshop? you should just ask the guys there wouldnt it be easier for them to tell you then us just guessing??

 

look forward to seeing the finished product

 

Yeah, asked them for advice that's how i got into this mess

 

sounds to me like the primer and paint are having an adverse reaction.

aka orange peal...

make sure that the primer and paint are compatible.

 

Yes I also believe the Primer and the paint are having adverse reactions. I am going to sick with regular automotive primer, since i am using automotive paint.

The primer and paint i have bought are compatible.

 

I just finished sanding it down to the bare surface, tommorow i will try to prime it. I will keep you guys posted, thanks.