How to get self-etching primer safely off plexiglass?

What should I use to get dozens of specs of black self-etching primer off curved plexiglass? Would a micro polisher with wool pad and Farcela G360 Super Fast Compound work? Should I try using K-Clear 707? What speed should I run at? Any good videos I should watch if I’ve never used a rotary buffer before?

Also, aside from getting the specs of primer off, there`s also deep scratches I want to try to remove. Does anyone know of any good videos that explain how to wet sand plexiglass to remove deep scratches caused by something like a flathead screwdriver?

Thanks in advance for the help!

I`d try a plastic polish first. Might not cut it though.

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Originally Posted by wannafbody

I`d try a plastic polish first. Might not cut it though.

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Yeah, it`s on there really tough and the plastic polish won`t cut it.

I would research and find who makes plexiglass parts and ask them how to remove primer off of it...
Dan F

Do the specs come off with your finger nail? Do you know the brand of paint?

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Originally Posted by Dan

Do the specs come off with your finger nail? Do you know the brand of paint?

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They do not come off with fingernail, not even with a plastic scraper unless you press so hard that you scratch the plexiglass. I do not know the brand of paint sadly and cannot reach the guy who screwed up on it.

Carrier solvent of the paint has resulted in the plexiglass surface being slightly "melted", so it is now part of plex.

I think Ron Ketcham has "diagnosed" your problem and it is a dilemma and, quite frankly, there are no easy fixes to your curved plexiglass part.
What I and the rest of us do not know is:
1) How big this plexiglass part is, and,
2) How critical of a part it is: IE, is it something you look through constantly, like a windshield or custom viewing port cover in a hood to see the engine, and,
3) Can it be replaced with a new or used part

If it is a on vintage vehicle, that may be impossible to even find.

Obviously, based on your request, you are, indeed, trying to salvage this plexiglass part. I am NOT a wetsanding expert, but if this plexiglass part is like a headlight lens cover, you may want to try a headlight lens cover restoration kit that includes the wetsanding abrasive papers with it and go that route. Now, will it work? Don`t know. But nothing ventured, nothing gained. This suggestion is just that; a suggestion. You and your plexiglass part are the "guinea pig" in this experiment.

Let us know what you do. Lexan/plexiglass is not an easy material to correct and make it look "clear". The deep scratch with a screwdriver probably will not come out, but you can mitigate the rough edges and make it less visible and more opaque, IE; easier to see through.

Last suggestion is to take the part to a plastic fabrication shop and see what they might offer. My experience is sub-contracting them to make see-through flat-panel (nothing curved or formed) safety guarding on machines and they can do some very good work, albeit (very) expensive.

Try rubbing alcohol. First, if you can test it on an inconspicuous area then the real thing. I have always had really good results with rubbing alcohol on plastics with gentle, constant motion.

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Originally Posted by BrownBarbie

Try rubbing alcohol. First, if you can test it on an inconspicuous area then the real thing. I have always had really good results with rubbing alcohol on plastics with gentle, constant motion.

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Congrats on your first post!