i have a front lip that was painted from previous owner. What would be the best way to remove the paint? i was thinking paint stripper but was afraid of it eating thru the polyurethane?

 

Try lacquer thinner. That should work for you.

 

only correct way of doing it is to sand it. You dont ever want to use a caustic liquid or solvent on polyurethane or any other plastics. Even bumper stripper is not good for it. Once you sand the polyurethane it will start to emit a bit of oil that may give you problems when you paint it later, you want to use a good plastics cleaner/degreaser before you paint it. i would suggest sanding all the old stuff off, prepping it, cleaning it, using plenty of bulldog adhesion promoter and priming it with a good 2k primer to make sure you dont have any problems later. than prep the primer and go along with your painting.

 

What about acetone?

Just curious as I've done this to an RS front lip that I needed to have redone and to remove the old paint, I just grabbed a rag and soaked it with acetone and then just applied it to the lip.

It removed most if not all of the old paint and pretty much painted over it (with proper prep after the old paint removal of course) with no problems at all.

Just curious if what I did would cause problems in the future. As of right now, the paint is still good (after two weeks).

 

Acetone is known to melt and deform plastic,I work with the stuff pretty much every day.A friend of mind that paints resin model kits uses Easy-Off oven cleaner to strip paint off of resin and vinyl kits.Not sure if this will work on a urethane lip so take that info for whatever it's worth.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by randomtask77 &raquo;</TD></TR><TR><TD CLASS="quote">What about acetone?

Just curious as I've done this to an RS front lip that I needed to have redone and to remove the old paint, I just grabbed a rag and soaked it with acetone and then just applied it to the lip.

It removed most if not all of the old paint and pretty much painted over it (with proper prep after the old paint removal of course) with no problems at all.

Just curious if what I did would cause problems in the future. As of right now, the paint is still good (after two weeks).</TD></TR></TABLE>

acetone is just as bad as lacquer thinner and strippers. Its really all about how long the acetone sat on the material. Acetone is actually "hotter" than lacquer thinner and can cut through things alot easier and doesnt evaporate as quick as lacquer thinner. But its also not as bad as plastic strippers. You may not have a problem at all if it was only on the lip for a short time, but if it just sat on it and had a chance to eat into the plastic, you may experience paint weakness or possible peeling later on.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Zerophase &raquo;</TD></TR><TR><TD CLASS="quote">Acetone is known to melt and deform plastic,.</TD></TR></TABLE>

exactly. most cutting agents are not good for plastics. Lacquer thinner, acetone, hell even mineral spirits arent good for plastics. But in all reality it was probably a better alternative than paint stripper seeing as the stripper is alot heavier bodied and can deteriorate plastic alot quicker.