Do Japanese built cars require extra rustproofing protection

[Mazda5tamworth]

I've recently bought my first Mazda MX5 a 2004 model. However on visitng my local mechanic earlier this week for 2 new tyres and an oil change they noted that Jap cars are not properly rustproofed around the underbody chassis. Is this true? Should I have my undercarriage painted asap to protect against rust? I've just been reading this article online https://www.tiltrak.com/car-rust-proofing/

[blackyb]

A topic a few months back by Wayne highlighted the fact that imported MX5s are not as well protected underneath as European cars.

I would say get her up on a lift and have a good look underneath . If she hasn't been undersealed then get her done.

Remove as much plastic as you can, clean out all hidden corners and check with a borescope the inners of the chassis rails, if they look solid then get them treated as well.

Better late than never or so they say.

[Mazda Mender]

They are poorly protected the same regardless of the country they are sent and sold in,,,they all get done the same on the production line in good old Japan.
M-m