What is the best way to paint on plexiglass?

I am painting an outdoor sign on plexiglass and was wondering if anyone knew what the best way of painting it would be, It needs to be weather resistent, would acrylic paint work o.k. if it was covered with a polyurethane. And what would give the best look in the end. The sign is for a floral shop. Thank You!

What is the best way to paint on plexiglass?
You%26#039;ve chosen a very difficult project, dear girl.





Usually, plexiglass signs are not painted. It%26#039;s usually done with laminates which are adhered to the plexi.





I%26#039;m guessing that this sign is going to be back lighted...otherwise there%26#039;s no need to use plexi in the first place. If that%26#039;s the case, I would suggest painting your image on the back side of the plexi in reverse so that whatever you use (definitely not water based acrylic) will be protected from the elements.





If it%26#039;s a fairly simple image, I would recommend masking off the image and using a plastic adhering spray paint.... like Krylon Plastic spray. If it%26#039;s a complex image with many colours and details, would say visit a model makers shop. They usually have a good variety of paint that is meant for plastic surfaces.





Ultimately I%26#039;d have to say, don%26#039;t paint plexi. Create your image with good quality heavy vinyl...and if you need to add detail, paint the vinyl with model maker%26#039;s paint.
Reply:Look into getting a silkscreen sign made instead. Kind of like a decal, looks much better, no need to repaint. But, if you want to paint, I%26#039;ve seen some people score (scuff) the surface a bit to help the paint adhere better.



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