Spaying Plastic

[DCR3005]

To be honest I have never attempted to spray paint plastic before.

The videos I have watched don't look to difficult but they never primed the plastic first, just cleaned it with soapy water then dried and cleaned with alcohol.

My question is the plastic box in question has various scratches on it, not too deep but still scratched.
The vid I watched told to scuff it up with scotchbrite first so I was wondering if any scratches would remain once resprayed?
Is there any need to prime?


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[Billybob99]

I'm not sure but I would get rid of any scratches, I would imagine what they mean by scotchbriting it is to take the shine off so that the paint will take

 

[DCR3005]

I'm not sure but I would get rid of any scratches, I would imagine what they mean by scotchbriting it is to take the shine off so that the paint will take

Sorry if I'm sounding stupid but would priming it first cover up the scratches or would I have to sand it then prime it?


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[Lockett]

Deep fill primer will do the job if the scratches are not too deep. Can get it from halfords.

Scothbrite pads are to key the plastic to help the paint bond when spraying direct to plastic without a primer.

 

[BaDaBooM]

You need plastic primer otherwise the paint will wear of very easy. Scratches will show if you don't sand it and you should sand anything you are going to paint so the paint has something to stick to.

 

[Hammy]

Use wet and dry to get rid of any scratches and to give the primer a key, then spray with plastic primer before a top coat.
As above, paint will flake off plastic without a primer coat first

 

[DCR3005]

Cool, thanks guys


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[Jasen]

I've sprayed a fair amount of plastic, a green scotchbrite pad like used on a kitchen sponge is good to use, the scratches a very fine and easily filled w/ a one two coats of paint, and you can always wet sand before your final coat. Cleaning is key especially with plastic, even oil from your hands will cause you problems. There are spray paints specially formulated for plastics, not sure if it's sold there but Krylon Fusion works well, your local home center/ hardware store should sell something similar. If your going for black or gray you can pick up some bumper paint and adhesion promoter at most auto part's stores.
The other key is lot's of light fog coat's, don't rush the finish work