Can someone help me with interior painting tip for

A styrene acrylic ester copolymer emulsion which is base material applicable to interior and exterior wall emulsion paint.

Only up to 10%, that's usually for spraying

You can paint plastic with the correct interior paint code, most plastic in a car is one color all the way through, some manufactures paint over plastic, you need the interior paint trim code and have to call autobody supply shops if they can make up a pint of your interior paint, then someone has to paint it. Or just buy another one at the dealer or junk yard in better shape

Mix 50 50 with new paint add a small amount water ....and stir with rotery drill

My thought would be to hide it if you can with a reflective piece of polished stainless or aluminum to reflect the heat. I have run into your problem and no easy solution.

Acrylic paint is fast drying paint containing pigment suspension in acrylic polymer emulsion. Acrylic paints can be diluted with water, and can become water-resistant when dry.

The size tip you use depends on what you are spraying, how thin/thick it is and if you something like Flotrol to make it flow on the work better. Tip sizes are given as a decimal number and here's how to read them.
Example: .517 (the one most people, including you, need)
- The 5 means you'll get a ten inch swath of paint with the tip 12 inches from the work surface. 5's are for general painting, 2's and 3's are usually used for trim work.
- The 17 is the diameter of the orifice (.017) the paint passes through to get properly atomized. The larger the orifice, the thicker the medium you can effectively spray. .013's are used for very thin things like stain. .015's & .017's are for latex paints, .019's are for enamils, and .021 - .027 are reserved for thicker things like elastomerics.
Most likely if you are using an interior, latex paint, you'll need the .517 tip. Be sure to strain your paint so you'll get an even fan of paint and the best results. Even brand new paint has sand impurities in it that will effect the tips performance or plug up the filters.

Luckily, vinyl matt emulsion paint is water based and is fairly easy to remove. Use half a wooden garden washing line peg or similar piece of softwood with s mild solution of washing up liquid. The wood will rub the paint off the metalwork and the washing liqid will lubricate without the metalwork so not to damage it.
Hope this helps.

hi you never mentioned wheather the paint is gloss, emulsion etc?
if its emulsion it should be fine paste the border, draw some guide lines where you want the border to go so when you come to put it on you will know where it has to go, wipe it over with a damp sponge to get the excess paste off it, otherwise when it dries you will see the residue of the paste.
You can get border adhesive which is really good.

Good luck

Kindly

Richie