Rust blistering on o/s sill?

[georgeo]

Please could someone tell me how much of a problem Rust blistering on o/s sill is? as I've been looking at a 98 R reg. which looked a reasonable car with the exception of blistering around the osr wheel arch and under the sill level with the back of the door? eg. is this a majour or minor problem on the MX5?

[maz8062]

Expensive! Once it starts to spread it becomes an MOT failure point as it weakens the seatbelt stalks or whatever - Repair costs £200-300 and will not be a permanent repair. How do I know? I'm just having to get mine repaired and it's not cheap.

[green beastie]

re blieters my own had these, so got at it, there seems to be anouter sill attacced to an inner bit, the prob is that there is no paint in between them ,and it rusts like mad,, if you good with a welder ,cut it out and weld in wen metal ,then put in plenty of rust profer, the biggest prob though is,, the strip under the floor , along the sill, about 2, 1/2 inch in to middle of car, itis a total rust trap, go and prod it, green beast

[skinny]

mine was a bit further back, right in the corner in front of the rear wheels. but it was really bad, it went right through.

i decided not to get a top job done as it's not structural, and my car is never going to win any concours competitions, so i just got my friendly local welder to cut away al the rust and weld a panel in. £40 a side.

to do a proper job tho like you wouldn't notice it had been done, then yeh you're probably looking around £250