Well i ripped the bed off my 75 Hi-Boy today and I'm starting sandblasting tomarrow, and I'm debating on what to coat the the frame with my original intention was to use rubberized undercoating on the frame (probably brush on) and then paint over that with a gloss black, but then I was think why undercoat ? Why not just brush or spray a few heavy coats of enamel on it, What do you guys think ? also the frame is a bit thin in a spot do you think I should try and reinforce it or just let it ride...I'm not going to wheel the truck offroad probably just going to use it as a driver and I know there is quite a bit of strength left in the frame but it's a bit thin, a few small pin holes on the vertical part of the frame rail directly behind the cab where the most stress is placed

 

Hi Otto,
Man oh man. Seriously, I would consider a new frame. Myself, I would definately strap the bad areas with some mild steel the orig. thickness of the frame. That is the least I would do.
You probably don't want to change frames. But steel in that condition is going to continue to waste. That could be hazardous to your health in traffic. Thats just my opinion.
I don't know squat about the paint part. But sounds like a good idea to me. Might help stop some of the wasting or something.
Good luck.
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Wait. I changed my mind. I would definately strap it inside and out. If it's getting thin in the area that handles most all of the strees, the frame could buckle on you in a deep pothole at a
decent speed. tjmo.
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[font size="1" color="#FF0000"]LAST EDITED ON 29-Jul-01 AT 06:44 AM (EST)[/font][p][FONT COLOR="#0000ff" SIZE="3" FACE="Veranda"]
As long as your sandblasting, don't waste your time with the undercoat. Use a good quality epoxy primer and a quality acrylic enamel with hardner for the top coat. Before you invest in all that paint though, take the time to plate the inside of the frame where it is thin. I'm not an engineer, but based upon the frame under my 67, the main stress point on these frames is just in front of the rear springs.


p.s. on edit:

The reason I don't like the undercoating is that it does not chemically bond with the metal. I have seen countless times where the metal continues to rust right under the undercoating; problem is that you wont see it until it's too late.

Also, you should chemically treat the frame after the sandblast. From teh sound of the condition of this frame, sandblasting will not get the rust that is deep down in the pores of the metal. Regardless, anything you do is likely to extend the life of the frame.
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Otto, I don't know where you are located, but I have a 76 long bed frame in excellent cond. in Durham NC free for the taking. It came from a 76 F100.

Anyone interested?

John

jowilker
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66F100s Rule
In the cool still quiet of night you can hear chevies rusting away.

 

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Jowilker: Please don't tease the members. While I hate the term "Hi-Boy", if you re-read Otto's post, you'll recognize that he has a 4x4. However, if you should happen upon one of those sweet, rust-free, southern frames in the 1967 4wd variety, I'll be right over. :-)
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[font size="1" color="#FF0000"]LAST EDITED ON 29-Jul-01 AT 10:03 AM (EST)[/font][p]Yea Stockman your right I guess i have also seen frames where the undercoating is peeling off with rust and all, I guess I will reinforce the frame on the inside I'll just find a piece of c channel that has the same dimensions as the inside of the frame rail and weld it in, Also Stockman are you suggesting I use a rust conertor like por-15 on the entire frame before painting ? Or just some type of metal etch.....Why dont you like the term Hi-Boy ?

 

Darn it Thom, I had another one of them senior moments and forgot that the 4X4 frames are different. But the offer is still good on the frame. Heck I now have a 76 shortbed frame that is available axles included. :-)

John

jowilker
[link:www.ford-trucks.net/users/jowilker|Club FTE since 01 01] My FTE Page

[link:www.ford-trucks.net/users/jowilker/NCFTE.html|NC Truck Owners] NC Ford Truck owners group

66F100s Rule
In the cool still quiet of night you can hear chevies rusting away.

 

[FONT COLOR="#0000ff" SIZE="3" FACE="Veranda"]
The POR-15's and the Corroless is supposed to bond with the rust, so no other product should be necessary. I was thinking if you were going to be using an epoxy primer or a zinc primer. Etching primer I guess would work too. There is something that converts the rust and leaves a phosphorus coating. I think it's called ospho or something like that. Use something, but I guess anything you do will make it better than it is now, right? I like the idea of powder coating a frame, but have yet to take that plunge.

On to the term "Hi-Boy" ....I guess I just don't like the confusion it can cause. It really only should be used to refer to the F-250 in mid-77 where Ford started using the negative arch springs up front. The pre-engineering change trucks sit higher, hence people started calling them "Hi-boys" Before that, all F-250's 4wd's were built alike. The confusion comes in when some newbie stops by and says: "I just bought a 1970 F250 4wd; Is it a "Hi-boy" ;-)[/FONT]

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A friend of mine is restoring a car(Chevelle) and told me he is useing spray on bedliner to caot his frame after sand blasting.He said it would not peel and any color you want is available.

 

 

Yes i may use the brush on bedliner on other parts of the truck but not the frame, Well i did some sandblasting boy it was a bad day for it to, 90 and humid sand just stuck to ya but its never a fun job, what made it worse was just watching it blow the rust out of the pinholes and make them potholes so im definately going to reinforce or i was just thinking since the bad area of the frame is between the cab and the front rear spring perch that i would cut 2 feet out of the frame and make it a shortbox....Im not sure yet, i got most of it sandblasted but i still have to do the most of the inner frame rails and probably the axle then i'll weld it up and blast it, then its on to the front half of the frame

 

How big of a compressor do you have and what kind of sandblaster are you using? I am looking into doing this to my 67 F100 and just using gloss black acrylic enamel with a hardner then undercoating the bottom of the cab and the bed. Thanks Eric

 

I am using a really old i would say like 1950 westinghouse air brake co. aircompressor 2 cylinder 2 stage that came out of old factory, about 80 gallons, i would say you could probably use any 60 gallon 5 hp compressor and keep up just fine, as for the blaster its just an 100 pound pot using sand bought from menards a lowe's or home depot type store, silica sand to be exact

 

Do you know where to get parts for the old westinghouse pump? I have a dual piston one sitting around that need a seal and the piece on top that bolts to it and angles then goes to a tank. Eric