Results 1 to 4 of 4

Thread: Small Rust Spots

  1. #1
    Registered User
    Member ID
    CZCC-4865
    Join Date
    Sep 2003
    Posts
    5

    Default Small Rust Spots

    I'm in the process of welding in new front and rear fender panels on my '72 240Z. There are also a number of very small rust spots around the rear wheel arches, and along the front of the hood. They range in size from about 1/8 to 1/4 inch in diameter. Is it possible to simply clean them as best I can, perhaps apply phosphoric acid (like Ortho) and spot weld some new metal on top, and have a repair that won't bubble through in a few years?

    The alternative is to cut each or them out and weld in a small patch.

    Anyone have any experience along these lines?

    Many thanks.

    Bob
    Bob Spindel
    '72 240Z

  2. #2
    Her Majesty the 26th 26th-Z's Avatar
    Member ID
    CZCC-4148
    Join Date
    May 2003
    Location
    Sarasota, Florida
    Age
    67
    Posts
    3,854

    Default

    Bob,

    Spots are usually bigger once you get in to them, but if they are less than 1/2" diameter, you can drill them out an exact diameter and weld a flush "punch" back in. Look for a slug punch tool from some place like Eastwood that makes a metal slug in a specific diameter from sheet metal. There are a range of sizes available and it beats trying to make a patch.

    Drill a hole that is much bigger than the rust bubble to get the rust around the edges of the bubble. The slug fits flush and it is a true metal patch.

    Watch out with acids. Make sure you clean the area to get all the acid off.
    Last edited by 26th-Z; 03-03-2004 at 02:20 PM.
    Enjoy the Ride
    HLS30-00026
    HLS30-00027
    http://home.earthlink.net/~cwenzel/index.html
    Go Gators
    Go Butler Bulldogs

  3. #3
    Registered User
    Member ID
    CZCC-4865
    Join Date
    Sep 2003
    Posts
    5

    Default

    Great idea! Many thanks. (And thanks for the caution about acids.)
    Bob Spindel
    '72 240Z

  4. #4
    Her Majesty the 26th 26th-Z's Avatar
    Member ID
    CZCC-4148
    Join Date
    May 2003
    Location
    Sarasota, Florida
    Age
    67
    Posts
    3,854

    Default

    There's a lot of info on the net about using acids for rust removal. Some of the more concentrated acids such as Naval Jelly (35% phosphoric acid) can do some damage if not cleaned off properly. Acid in that high concentration will eat the metal. Something like OPSHO (less that 12% phosphoric acid) is considered a rust encapsulator because it is so weak.
    Enjoy the Ride
    HLS30-00026
    HLS30-00027
    http://home.earthlink.net/~cwenzel/index.html
    Go Gators
    Go Butler Bulldogs

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Bookmarks

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •