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CJ Frame Replacement

CJ-5 gets a restored frame

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POR-15 Rust Preventative Products
POR-15 Rust Preventative Coating Review

Every person that has ever worked on an older Jeep knows one thing...Jeeps rust.  This is especially true for those living in areas that experience winter time and the salty roads that come with it.  We recently completed a frame replacement on a CJ-5 and we wanted to take steps to prevent the replacement frame from suffering the same fate as the original.

CJ Frames Background
77-86 CJ frames are boxed front to back.  It is basically 2 C channel pieces of steel welded together.  Mud, salt, and other contaminates lay inside the frame rails and the frame rots from the inside.  The answer to combat this problem - POR-15 Rust Preventative Coating.

About POR-15
From the POR-15 website
"POR-15® is a high-tech, high performance rust-preventive coating designed for application directly on rusted or seasoned metal surfaces. It dries to an incredible rock-hard, non-porous finish that won't chip, crack, or peel, and it prevents rust from recurring by protecting metal from further exposure to moisture."  POR-15 produces several other rust preventative products, see their site for more info.

Preparation and Application
All frame work (welding, drilling, fabrication) was completed and the frame was cleaned of all loose rust and degreased thoroughly.  After a good drying POR-15 Metal Ready was applied to un-rusted metal to etch the surface to allow the coating to adhere.

The POR-15 coating was applied on the inside of the frame rails first.  This can be tricky and almost impossible to insure complete coverage.  We did our best by mixing the POR-15 in a spray gun and rigging up a small flexible tube to help aim the spray around the inside of the frame rails.  The coating was then applied to the outer surfaces of the frame rails using a brush.  The coating dries rather quickly and melts together leaving a glossy finish with no brush marks.  Forget brush cleaning - use a new one.

Be sure to wear protection on your hands and eyes when applying the coating.  This stuff on your skin takes weeks to wear off.

We were left with a new looking frame with a hard and glossy black finish, ready for everything to be reassembled.  The finish is very hard and withstood the punishment of parts installation, tools, and general contact.



rotted CJ frame

POR-15 Metal Ready

A Year Later
The finish has held up well.  No rust through, chips, or problems.  One thing though areas exposed to prolonged sunlight do develop a milky colored haze.  POR-15 does acknowledge this and advises painting over exposed surfaces to prevent this haze.  The protection to sunlight exposed areas does not diminish.   No damage to the surface has occurred from flying debris.  Another pleasing quality of the POR-15 is that it is a non-porous coating so cleaning mud and dirt is extremely effortless.

completed finish

Related articles

78 CJ-5 Frame Replacement

V8 into a CJ or YJ

Protecting Your Jeep's Underside


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