Paint crackling

[PlenumBiscuit]

I painted this parcel light cover black with vinyl paint which supercheap auto guy suggested.

Why has it gone all crackled?

I wet rubbed it and wax n grease removered it

 

[Kingcarl]

Hey mate,
Did you plastic prime the part first?
What grade paper did you rub it with?
It is hard to say without physically seeing it but IMO it looks like to much product to soon. Generally it is best to build up coats gradually. Those first 2 coats you just want it to lay down nice then build it up.

 

[PlenumBiscuit]

Thanks the spray can said no primer required

The first coat i did was very light and the cracks appeared straight away after half hour of drying

Wet Sand paper says p320

 

[Kingcarl]

Thanks the spray can said no primer required

The first coat i did was very light and the cracks appeared straight away after half hour of drying

Wet Sand paper says p320

If it was me I'd rub all that off with 600 wet. Throw that can in the bin lay down a nice coat of plastic primer let that tack off and then spray it in whatever. The reason i say use plastic primer it does not bite as hard into the plastic and gives a good base for the top coat. Goodluck mate

 

[VT&VX]

They wrap cars in vinyl (including bonnets) maybe there is an Auto grade vinyl wrap product that would be better suited? carbon fibre pattern?

or matt paint might not show the cracks as much

 

[Sean880]

Thanks the spray can said no primer required

The first coat i did was very light and the cracks appeared straight away after half hour of drying

Wet Sand paper says p320

The paint is not adhering as it should because the surface preparation was probably not adequate on that panel and an adhesion
promoter was not used.

1. On the raw panel you need to use a strong heavy duty cleaner to fully remove any protection coatings that may have been used as well as release chemicals still embedded on the panel surface from the manufacturing process.

2. Then you follow up with the wax and grease remover.

3. You should not paint over that without an adhesion promoter coating. If you don't use that adhesion prime coat first expect the paint to lift. Use the Dupli -Color Adhesion Promoter spray-on clear primer coat. Then you follow up with the final paint coating.
http://www.mmpindustrial.com.au/dup...plicolor-adhesion-promoter-clear-primer-311gm

 

[EYY]

Usually that happens because the original surface coating and the new coating are incompatible. Mainly happens when you mix different paint types - eg enamel with acrylic.

 

[PlenumBiscuit]

Bloke sold me this self priming coating

Is the parcel shelf light cover really vinyl? I have my doubts

 

[markalan1two]

No its hard plastic

 

[VT&VX]

No its hard plastic

It would be ABS

My suggestion was a vinyl wrap.

Sand all the paint off, now you have a raw and clean surface.
Follow the instructions from the vinyl product. Precut to the desired shape.
Warm the plastic car part up with a hair dryer and carefully smooth out the vinyl (it is adhesive backed) onto the plastic car part. Smooth out air bubbles as you press the vinyl in place. Trim excess.