Adhesion Promoter interior plastic

Say08

Promoted Users
Painting some interior plastic parts on mid 80s mustang. Plastic floats so I assume it need something. I’m using SEM color coat will SPI adhesion promoter work with this? If so any application tips? Thanks in advance for any help.
 
Yes sand the plastic first. You need a solid surface so get rid of any flaking or loose particles. Especially with old interior plastic the surface will be decayed from the sun. I use Bulldog Adhesion promoter but SPI should be fine. Follow the directions as AP have kind of fallen out of favor as the regular paints get more flexible. Unless I have bare plastic showing on bumper covers I no longer use AP but on interior plastics I still use AP.
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Yes sand the plastic first.
Sanding textured or grained plastic will ruin it. Clean it well, you can use scuff stuff and a grey scotch brite very lightly but you need to be careful.
Follow the directions as AP have kind of fallen out of favor as the regular paints get more flexible.
Ad-Pro is for adhesion not flexibility.

For those Mustang panels they should be bare plastic that is dyed/colored. They were not painted. Clean the panels well. Like I said above a grey scotch brite and scuff stuff used very lightly works well. Or Dawn and a grey scotch brite. Then use SPI 700 W&G remover and wipe everything down like you would an exterior panel you were going to paint. Use a dedicated paint prep wipe, never use microfiber cloths. Apply the Ad-Pro per instructions and proceed with your color coat. Read the instructions in the Tech Manual as well.
 
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Yes that's true but it really depends what you have to work with? I am almost always working on things that are so old that the the vinyl pattern on the plastic (If there is one) is the least of my worries because I just can't get another part. Plus the majority of my interior plastic usually require repairs of some kind and I regularly have to splice two parts together to make one good one or at least to get a usable part. Not a fan of plastic in general because it just does not last.

But you are right scotch brite would a better first choice as it's much gentler to the surface. Without seeing the level of decay of your plastic it's hard to say. I usually have to fall back to sanding to get a surface I want to work with.

Ps; Thanks for posting Chris! I wanted to say your forum picture ALWAYS get's my interest and I don't know the story behind that picture or even IF there is a story but that's a classic!
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