adheision problems
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Brian Dee
Super Moderator
is that lower valance plastic, and do you know if anyone has used someting like armor all on it. I've run into this before and discovered the guy was using furniture polish on it. You want to talk about delam and fish eye problems. Drove me crazy. If this is the case. Have a look at the post about using a propane torch on the surface to slightly oxidize the surface. Works like a charm.
Here it is.
There has been a few posts from people wanting to know how to prep plastic for painting. Yes it can be tough getting the paint to properly adhere to what I call bleach bottle plastic. An old time painter that was in the lime light 40 years ago,and still is, told me this little trick. Don't laugh, I know I did when he told me. I thought he was kidding me. Get your self a hardware store propane torch,and just waft it lightly over the surface. Go lightly you don't want to end up with true fire. What this does is that it slightly oxidizes the surface. Then hit it with a scotch brite pad. Wash the part with soap and water then dry it off. Don't use air as this will or could cause static to build up on the surface. After all this hit it with adhesion promoter and away you go. The paint will adhere like crazy,and you won't have any delam down the road. I've done this on plastic fenders, and twisted them every which way and could not get the paint to break loose. Didn't even crack. Give it a try.
Here it is.
There has been a few posts from people wanting to know how to prep plastic for painting. Yes it can be tough getting the paint to properly adhere to what I call bleach bottle plastic. An old time painter that was in the lime light 40 years ago,and still is, told me this little trick. Don't laugh, I know I did when he told me. I thought he was kidding me. Get your self a hardware store propane torch,and just waft it lightly over the surface. Go lightly you don't want to end up with true fire. What this does is that it slightly oxidizes the surface. Then hit it with a scotch brite pad. Wash the part with soap and water then dry it off. Don't use air as this will or could cause static to build up on the surface. After all this hit it with adhesion promoter and away you go. The paint will adhere like crazy,and you won't have any delam down the road. I've done this on plastic fenders, and twisted them every which way and could not get the paint to break loose. Didn't even crack. Give it a try.
T
TAZ
Guest
Possibly Armor All, road grime, wax, or some other type oil got on it and soaked into the old paint.
Or, if it's a brand new raw plastic piece, they used a 'release agent' in the mold.
This gets into the plastic and is VERY hard to get off before painting. It 'pushes' the paint and the primer right off. Almost like waxing before you paint.
Or, if it's a brand new raw plastic piece, they used a 'release agent' in the mold.
This gets into the plastic and is VERY hard to get off before painting. It 'pushes' the paint and the primer right off. Almost like waxing before you paint.
HAvent tried the torch trick but I have had good luck with stubborn paint sticks by using redmax degreaser. It is an acid based degreaser for cleaning engine blocks. Spray it on full strength throw on a latex glove and give it a scrubb with a red scothcbrite. spray another dose and then rinse the heck out of it. The i come back with some presta scuff stff and a gray scothcbrite for a final wash. where the water beads you need to hit again usually in the curves where you cant get your fingers lol. give it a good rinse and let it air dry. some adheasion permoter and knocking on wood in 2 years never had an issue.
the torch trick does work, but if your not shure of doing that just wash it with degreaser first and then hit it with a scuff pad and some (scuff tuff) wich is a soap with grains of sand and that should clean the surface really good. when ur done with all that rinse it and make shure that there is no soap or anything on it, once you done with that hit it with pre-cleanear wich is a wax remover and spray a plastic adhicive on it such as bully dog wait 5 min and then start spraying your base but first hand just mist it. after that its all yours and it shouldnt give u no problems..