Starting to paint interior, primer is rough?

[ziggo0]

I can't stand the hideous color of the grey in our interiors so I've pulled it all out while the car waits on a motor and I'm converting it over to black. I lightly sanded to rough up the pieces with 400 grit sand paper. Prepped with brake cleaner/soapy water, then 2 layers of adhesion promoter and was doing a good primer before the paint. On some pieces the primer came out smooth, others it came out sorta rough? Does this matter since I still have the final layer of paint to put on? Or will the roughness pass though the final layers of paint and leave an overall rough texture (not stock).

 

[Spoolin18]

I can't stand the hideous color of the grey in our interiors so I've pulled it all out while the car waits on a motor and I'm converting it over to black. I lightly sanded to rough up the pieces with 400 grit sand paper. Prepped with brake cleaner/soapy water, then 2 layers of adhesion promoter and was doing a good primer before the paint. On some pieces the primer came out smooth, others it came out sorta rough? Does this matter since I still have the final layer of paint to put on? Or will the roughness pass though the final layers of paint and leave an overall rough texture (not stock).

painting over primer that isn't sanded is a no no. Spray another coat over them, then wetsand with 600, then spray paint and clear. Anything on the primer coat will affect the outcome.

 

[vanilla gorilla]

Im not sure why you used a primer on the plastic pieces. Keep in mind, the more layers of paint/primers you add, the easier it will be to crack once the piece flexes. A good etching adhesive promoter made specifically for use when painting interior pieces would have been good enough. But since you already primed the peices, yes primer sometimes comes out rough (especially a high build. A primer/sealer lays down perfectly smooth depending on how you spray it). To smooth primer before paint, a light wet sanding with 400 grit will quickly take care of it.

 

[skatershawn]

^agreed.... Never paint primer intell you have wetsanded the primer first!
and i think i would go with a finer grit!

well for interior.. inless you want a ultra smooth finish then 600 with do great!!

Or will the roughness pass though the final layers of paint and leave an overall rough texture (not stock).

And YES as the paint starts to dry it will tighten up into ever place it can and you will see the roughness more then you did when the paint was wet!
that is way it is extremely important to wet sand both primary and final coat before spraying the clear coat! (on exterior parts)

 

[JDOliver]

It will be rough. The paint is a pretty thin film, so if the primer is rough it will be also. If when you spray the primer it is sprayed thinly it will dry in the individual drops that pile up rather than flow together into one solid film. You have to paint it wet enough to flow together but not run, which is tricky.

I primered a whole car with too fast a reducer once and it was like sandpaper.

 

[ziggo0]

painting over primer that isn't sanded is a no no. Spray another coat over them, then wetsand with 600, then spray paint and clear. Anything on the primer coat will affect the outcome.

That's what I was thinking, thanks for the advice

 

[Spoolin18]

That's what I was thinking, thanks for the advice

If it helps, don't forget to tag my post as helpful. Thanks.

 

[vanilla gorilla]

Well if you are stuck on the idea of spraying another coat of primer over the coat you already have (i do not understand the reasoning behind this), you need to first sand the primer that is already on the piece so that the new coat will stick.

 

[Smurf2gGSX]

i did this with some of my interior panels and i used bulldog adhesive promotor then a just a basic black spray paint and it turned out great, 6 months later and it still looks great.

 

[vanilla gorilla]

Bull dog is good stuff. Though I would recommend SEM brand promoters and paints for interior panels.

 

[Spoolin18]

Bull dog is good stuff. Though I would recommend SEM brand promoters and paints for interior panels.

I always use sem products.

 

[fstfcs]

SEM all the way never been done wrong by them.

Like everyone else said always wet sand. I used to work at a body shop and we did a little interior work. NEVER lay paint without wet sanding the primer first. Everything you do in painting will always effect the outcome of the next step.

 

[ziggo0]

I do not plan on doing 2 coats of primer, like everyone has said its pointless. Went out and got more sanding supplies, going to sand all the pieces and get them ready for paint! Only problem is, all the auto parts stores around town are either completely out or do not carry Dulicolor stuff anymore, WTF??

 

[Spoolin18]

Sand down the primer coats already applied, hell, I've even used krylon fusion plastic paint and shot a clear over it.