Auto body supply Taipei or real cheap paint job

I’ve got an old beater Suzuki (white) that is losing its clear coat, has a couple of rust spots, and could use a proper repair on the rear door sill. Water pools there and it has rusted a bit. The car isn’t worth much, but it runs good. I painted a few cars when I was a kid, and I was thinking about doing a few spot repairs primering it, and maybe cutting out the rear door damage and either finding a replacement to jam in (and have welded properly later) or else doing a sheet metal / fiberglass home brew repair on it.

Anyone know where to get fiberglass resin and materials, bondo , putty, rust inhibitor/ primer, blocking clay, cutting polish, and other stuff? I have a few tools, and have a paint match. If i can just do some repairs, blend in the new paint, polish it up, and then keep it waxed, it might look good enough.

Either that, or a cheap painter that won’t sneer at my beast or charge me too much. the car isn’t worth spending too much on.

Thanks in advance!

got any luck? what did you end up doing?