Mazda Bongo & Ford Freda Undersealing in Plymouth, Devon 

Let's start by saying that nothing and nobody can totally prevent untreated steel from rusting! But treating steel can help to prevent rust. So we have invested in new equipment to treat your Bongo or Freda and help to keep rust away.


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, we 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 time varies depending on how the Bongo is used. It is generally every 3-5 years. This varies depending on weather conditns and vehicle use.

How do we underseal a Mazda Bongo or Ford Freda? 


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

We use high pressure sprays to remove flaking rust. 

Your Bongo is dried. 


We can remove underbody panels or sills that are badly corroded on your Bongo. We can weld in replacement panels and sills.


We seal areas on the Bongo that should not be treated, such as breather vents.

We apply Waxoyl (wax oil) rust prevention treatments under pressure.

The Waxoyl treatments can be injected into body panels on the Bongo. 


How long does it take?


Your Bongo or Freda is best left with us for one full working day, and then overnight. 

If this is not possible, customers can choose to collect their Bongo as late as possible, on the same day.


What does it cost?


Not everybody wants, or can afford, a high-cost treatment.

So our treatment options are tailored to suit you.

They are all prepared in the same way.

We then underseal the Bongo to suit your needs.

Our price starts from £150+vat for underside only.


Underseal can be re-applied after time, and the price of this will vary, depending on how much needs to be done. 


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


If you fancy undersealing your Bongo yourself, we found a video that shows you the general idea: WAXOYL APPLICATION GUIDE

Welding a Mazda Bongo or Freda in Plymouth, Devon

We remove excessively corroded sills and underbody panels.

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, grinding and then welding replacement panels and repair patches to the Bongo, to get it back to good condition.

Needless to say, now the Bongo's passed its MOT, it's going to be undersealed.

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 Secure

1. If you have any COVID-19 symptoms, no matter how mild, please rearrange your booking. If you arrive with symptoms, you will be turned away.

 2. Please remove any items which prevent clear access to the areas I need to work on.

3. Please leave all doors open, to clear air from your car. If it's raining, leave all windows wide open. 

4. Place your key in the drop-box in the lobby at the reception entrance.

5. The area of your car that I work on, and your keys, will be sanitised before and after working.

6. You can no longer wait in Reception. You are welcome to stand in the lobby by the open door. I'm next to NT Saltram House, where you can walk, or sit and enjoy the views.

7. Payment by debit card. No cash accepted.

8. 24hr drop off and collection can be arranged, at your own risk. 

I will update these rules when the situation improves. Take care everyone. Full details on THIS LINK


Trading Standards Approved Garage, Plymouth, Devon

IMI Member

Trading Standards Approved garage Click to see membership details
IMI membership link Click to see membership details

FSB member

Member of FSB link Click to see FSB details

AA listed garage

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