Mazda Bongo & Ford Freda Undersealing in Plymouth, Devon 

I've undersealed Bongos in Plymouth, Devon, for over 17 years. Nothing and nobody can totally prevent untreated steel from rusting! But undersealing a Bongo can help to prevent rust. I've invested in new underseal equipment, to help to keep your Bongo rust-free.


Why does a steel vehicle rust?


Rust is formed when steel and oxygen react with water or mositure in the air. Surface rust is flaky and permeable to moisture. Beneath this surface rust, more moisture and oxygen make contact with steel. And it continues to corrode. Given sufficient time, your steel Bongo will completely rust away. Waxoyl rust treatment provides a barrier between the steel, air and moisture.


How long does it last?


By undersealing your Mazda Bongo or Ford Freda, I can start to prevent the worst damage that rust can do.

If undersealing treatment is reapplied to your Bongo at intervals, it can continue to help to protect your vehicle from corrosion. The re-application inteval is generally every 3-5 years. This varies, depending on weather conditions and vehicle use.

How do I underseal a Mazda Bongo or Ford Freda? 


First, I clean the Bongo's underside to see the rust clearly.

I use high pressure sprays to remove dirt. This also removes some flaking rust. I may also need to wire-brush the rust; its a labour-intensive process. 

Your Bongo is then dried. 


Some Bongos require more preparation than others. This can include application of rust converter or welding badly coroded areas, crossmembers etc. 


When all the preparation is complete, I seal areas (such as breather vents) that should not be treated with waxoyl.

If the waxoyl treatment includes injection into panels, I remove grommets, stoppers, lights etc, to gain the access I need.

Waxoyl (wax oil) rust prevention is pressure-sprayed and leaves a clear or black, waxy, moisture resistant coating.

Inside the panels, it's applied as a mist, so it penetrates further.


How long does it take?


Its best if your Bongo is left with me for one full working day, then overnight, to give the waxoyl time to harden fully.

But as many customers can't leave them overnight, I'm happy to start work early, so you can collect the same day  

If a lot of preparation or welding is needed, it may take 2 or 3 days. I can let you know when we discuss undersealing of your Bongo.



What does it cost?


My treatment options can be tailored to suit your budget.

I can underseal just the underbody, or the underbody including wheel arches and under bonnet, or the under body, wheel arches, under bonnet  with injection into panels and cavities. But I don't cut corners and I take time to do a proper job, with the experience gained from 17+ years of undersealing Bongos. This costs from £210 including vat.


Contact me to book your Mazda Bongo or Ford Freda underseal at my garage in Plymouth, Devon


If you fancy undersealing your Bongo yourself, I found a video that shows you the general idea: WAXOYL APPLICATION GUIDE I advise you to wear protective clothing and a mask designed for this work, so you don't inhale the waxy mist.

Welding a Mazda Bongo or Freda in Plymouth, Devon

Rust and corrosion on a Mazda Bongo

These are a few photos of rust on an untreated Mazda Bongo.

As you can see, it had never been undersealed.

It came in for an MOT and failed on 'excessive corrosion' in several places.

It took a me a couple of days of cutting and grinding to remove the rusted parts and weld replacement panels and repair patches. Once it was restored to good condition, I undersealed it to help to keep it that way!

Needless to say, the Bongo then passed its MOT.

Mazda Bongo sill Corroded Bongo sill
Mazda Bongo rust repair Rusted Mazda Bongo
Mazda Bongo underseal Bongo corrosion
Mazda Bongo rust repair Rusted Bongo underbody
Mazda Bongo undersealing Corroded Bongo underbody
Mazda Bongo crossmember New Mazda Bongo crossmember

Allans Vehicle Services,

Wixenford Depot, Plymstock, Plymouth, Devon, PL9 8AA.

VAT no: 909 7647 80

Book an appointment

Tel: 01752 403400

Mob: 07471 002034

Text: 07471 002034


I work on my own. If I can't answer right away, please leave a message with your telephone number, so I can return your call.


Email: hello@


If you contact me on Saturday or Sunday, I will respond on Monday.


Open Mon - Fri 8am til late.



Allans Vehicle Services

Wixenford Depot

Colesdown Hill





Terms and Conditions

Vehicles, keys and contents left at owners risk. Please read this link for full details.

Covid safety measures

1. If you have any symptoms, please rearrange. If you arrive with symptoms, you will be turned away. 

2. Wear a mask and keep a 2m+ distance.

3. Only 1 person to enter office.

4. Use hand sanitiser supplied.

5. Keys in drop-box at entrance.

6. Leave car doors or windows open, to clear air. 

7. I will sanitise your keys and the areas of your car that I work on.

8. I'm sorry, you can no longer wait here. I'm next to NT Saltram House, where you can walk, or sit and enjoy the views.

9. Payment by debit card. No cash accepted.

10.Contact free, 24hr drop off and collection can be arranged, at your own risk. 

 More details on this link.


Trading Standards Approved Garage, Plymouth, Devon

IMI Member

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FSB member

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