Removing rust from trailer

 G'day,

I'm about to pull the boat off the trailer (box section) and attack some rust on my trailer. Not sureof the best way to go about it.

I'm thinking of just grinding/sanding rust where possible and once back to bare steel just primer and then paint.

What are best tools to sand/grind in the hard to get to spots? 

What are the best options to coat the bare steel? 

I'm not sure how to go about treating the insides of the box section so I'm guessing she'll have to rust from the inside out.

 

Any help will be appreciated.

Cheers

 

 

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Bend over


Faulkner Family's picture

Posts: 17919

Date Joined: 11/03/08

Wire brush on a drill works

Thu, 2024-05-02 13:13

Wire brush on a drill works well. Treatment wise there is a product called furtan which converts rust then prime and paint.

CRC  also have a new product out that does the same

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sunshine's picture

Posts: 2575

Date Joined: 03/03/09

And Fertan will passify rust inside tubing

Thu, 2024-05-02 18:29

 Just need to find a way to atomise spray it inside.  A Bunnings pressure spray should work pretty well, some come with fairly long fine gauge hoses. Catch any excess running out and reuse.  Understand it reactivates if it gets wet so continuous passification occurs 

Swompa's picture

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Date Joined: 14/10/12

 Not sure how much time you

Thu, 2024-05-02 13:14

 Not sure how much time you have but internally will be near impossible to get to. I attacked mine with a wire wheel before sending it off for acid wash and being re-galvanised. 

For my 5.6m boat trailer it cost around $300 and $400 to replace all the bolts and most rollers

Brock O's picture

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Date Joined: 11/01/08

As above, strip it send for

Thu, 2024-05-02 20:49

As above, strip it send for acid dip and Galv.

sstevee's picture

Posts: 468

Date Joined: 15/11/11

 I am currently looking to do

Fri, 2024-05-03 09:30

 I am currently looking to do the same. Mine is RHS and the frame externally looks good but the galv is lifting internally. I was going to try and get a wire brush up the rhs sections and then modify a roller and try get that up there. I was going to use a product called Metalfix made by phoenix paints in Bibra Lake. 

I do have the issue of the cross members being 50x50 shs which I practically have no way of getting to the inside. I would be lucky to have a 4-5mm gap where it is welded to the frame. My thoughts were to sort the outside and paint and when they become too far gone to just cut them out and replace them.

Being a tinny trailer i'm not sure if the re-galvanise option would be cost effective?

Does anyone know if the acid wash actually clears up / eats away the loose flaking metal inside the shs? 

Brock O's picture

Posts: 3182

Date Joined: 11/01/08

I did a strip down on mine a

Fri, 2024-05-03 11:42

I did a strip down on mine a few years back, the main frame I grinded and hit with a 9" wire buff wheel before it was sent for Acid deep and Galz, the lad at the Galvanizes said it took 3 dips to get the rust off...charge was just over $4 per Kilo from memory.

Sea-kem did help me with this using his account, thanks again mate!.

All the small items I dipped in a large tub with pool acid, this basically stirps anything in a very short time frame...just don't put your head over it and breath in, you wont wake up till the next day...if ya lucky. Following this I added a few coats of good quality zinc just by brush and hand, with in a few years these items are showing medium corrosion already. they will get HDG soon after a few more mods.

This was during tough times, but I wanted get the main frame done to avoid a heavy cost later, yes you may need to budget this in, but with winter coming now's a good time to sort these projects, unless you want to buy new.

Boat trailers are probably the most easy thing to work on mechanically, even with zero skills, everything is reasonably cheap to replace and available via the trailer shops...not fkn supa cheap or the likes. Start with a cheap 5" grinder and some cutting dics..:)

Posts: 1328

Date Joined: 05/05/06

 I just gave the galvanising

Fri, 2024-05-03 14:34

 I just gave the galvanising place in Henderson a ring and asked for a rough estimate. I think I made the rust sound worse than what it is so I was quoted $5.30/kg. I'm thinking the frame stripped down may weigh 150kg. 

Hey swompa what did your frame weigh?

As mine is about the same length

 

Cheers fellas, convinced to the galvanising as it should be a longer term solution and from what I've read no matter how you treat it/paint the rust comes back pretty quick. As Brocko said paying the cost now will save the purchase of a new trailer or sale of the boat in a few years which I'm not keen on.

 

Hey sstevee mine is similar to yours with the gal flaking off mainly on the inside of box section and in areas on the cross members.

 

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sstevee's picture

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Date Joined: 15/11/11

 I would be interested to

Fri, 2024-05-03 21:02

 I would be interested to hear how you go with it mate. With the metalfix paint at $70 a litre there may not be too much in it. 

Swompa's picture

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Date Joined: 14/10/12

 Mine was a Papas A frame

Mon, 2024-05-06 09:36

 Mine was a Papas A frame trailer. The trailer with the wobble roller brackets came in at 166kg (thanks to me putting the info here when i was doing the project). I didnt do the mud guards but should have. I borrowed a car trailer to get it to and from the spot and could manually lift/drag most of it

fishwrecked.com/forum/trailer-re-galv

I suggest calling a couple of places to confirm the price. 

And dont forget to take the shackles off your trailer chains. 

Swompa's picture

Posts: 3826

Date Joined: 14/10/12

For what it is worth, my

Mon, 2024-05-06 09:51

For what it is worth, my trailer was about 15 years old and I always washed it down.

The galvo guys said that the rust was pretty bad internally and told me to probably not put a really expensive boat on it. 

 

When i sold it a few years back, it was still in good nic, but some of the shitty spots where the galv didnt properly bed in (almost where the slag stuck onto the frame) had started to show spots of rust but it still seemed fine. 

 

sea-kem's picture

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Date Joined: 30/11/09

 The problem with RHS is you

Sun, 2024-05-05 09:43

 The problem with RHS is you can't guage internally how rusted it is as I found out the hard way one time up north where the rear of the trailer broke as it was rusted out internally.

Even acid dip and regalv won't really sort the problem as it will have flake rust internally that the acid won't strip. Most galvanisers even with externally flaked rusted steel will recommend blasting. 

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sunshine's picture

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Date Joined: 03/03/09

Andy, any idea of cost of blasting

Sun, 2024-05-05 10:08

And can they blast inside rhs 

sea-kem's picture

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Date Joined: 30/11/09

 Not sure about internal

Mon, 2024-05-06 08:58

 Not sure about internal blasting Gordon but can see why they couldn't shoot the nozzle down there. It's not prohibitively   expensive.

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Love the West!