Does the trick : "If it floats , it needs adpro" apply to all plastics?

[Phoenix]

Flexible and rigid?

I got ford festiva bumpers to do , with a P-TE marking in the back. Everything is on bare plastic.

I got the spi 600-4 on the shelf.

Thanks.

 

[Barry]

Yes and even if it don't, still a good rule to follow.