Hello I’m sorry I know this has been discussed lots of times on the more general technical area, but I’m just wondering if anybody in the Essex area has has their MK4 undersealed locally (not necessarily by a Mx5 specialist) if you are happy with it , price etc .
I had my ND 30AE treated with Dinitrol when new in 2019 cost £558-00 inc. VAT by -
PMW Ltd., (Peter Mould Workshop Ltd.),
7 Atholl Road,
Dukes Park Industrial Estate,
Chelmsford. CM2 6TB
Phone: 01245 496739
Email: pmw1@btconnect.com
Web: pmwltd.co.uk
Very happy, professional job, with photos
Thanks for that . I have looked at their website as we are not far away from them , but as they promote themselves as BMW , German specialists I was unsure if they would know too much about an Mx5.
After mine they should do. They took it in for an appraisal before they would commit themselves, so they don’t pretend, they make sure they can do a job up to high standard rather than just bodge. They specialise in servicing the BMW’s, Merc’s etc., that’s why they promote that.
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I know we all have different opinions, but would you as a seasoned MX5 owner undersealing is essential ?
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I would never under seal one I think it’s pointless. I buy new or nearly new cars and sell them long before they rust. You get the same amount when you sell them on so you are wasting hundreds of pounds for someone else’s benefit. I know it’s a bit too little too late to do once the rot has set in but that’s not my problem.
Each to their own tho
I think I would normally agree with you as we don’t tend to keep cars too long , but we have been talking about maybe keeping this one so I was wondering if Mx5s are more prone to rust than any other new car .
I always buy my cars as “keepers” and as MX5 only have minimal stone-chip protection on certain parts and no general underbody protection I had both mine treated asap after delivery. If you intend to keep it, do it!
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For a keeper I would have one done yes. The MX5s do seem very prone to rust. Mazda don’t have such a great anti corrosion reputation as the bigger marquees.
And I don’t mean to sound selfish with my view but it is what it is, I’m not about to blow hundreds of pounds for someone else’s benefit.
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I don’t think it’s a selfish view at all, truthfully I would rather not spend the money unless it is to protect my investment.
I can still remember my dad painting waxoyl and hammerite on a ten year old Alfasud that was already more rust than paint 
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As per @Mrbarry not worth undersealing an ND unless you are keeping it for ever.
Just make a point of pressure washing the wheel arches and underbody after winter to get the salt off.
Same as any car really, if you keep the arches and underside clean and free of mud build up and salt, no serious rust should take hold. Have some hammerite at the ready to rub down, treat and touch up any small rusty areas.
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PMW just fully rust proofed my NC. Can definitely recommend them 
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I don’t drive mine in the winter then I don’t have to clean salt off 
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I’m lucky not to have to drive mine in bad weather or on salty roads… My ND2 is my Pride-And-Joy and I keep it properly maintained, cleaned and polished… Not sure on the whole undersealing thing yet - I saw many Mazda’s underneath whilst working at a main dealer, and yes, suspension components, subframes did suffer with a lot of surface rust… Often looked worse than it actually was… There are so many companies out there who are willing to take many hundreds of pounds from your bank account to do underbody protection/undersealing, as well a paint conditioning and detailing up top… I’m sure many do really good jobs with many satisfied customers…
I’m trying hard not to obsess about these issues as it takes some of the spirit out of what the MX-5 is about - The enjoyment of driving…! 
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I have decided not to underseal my mx-5 ND2 bought new in 2019. It is a second car and therefore only used in the dry and never on salted roads. I have been put off by underseal potentially trapping moisture and I also don’t like the idea of obscuring areas underneath with gunk. I anticipate and accept there could be a small amount of surface rust in certain places over time, but hopefully nothing major. If I used the car as a daily driver on salted roads then I would probably get it undersealed.
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I’ve been using PMW for over ten years, and useful to know that can treat an MX5, when I get mine.
Yes if it’s an older car (and not too far gone) but no if it’s brand new and you intend to sell / chop it in after three years - though an enthusiast buyer may prefer it to have been done. I read somewhere that some Mazda dealers offer the additional underseal which could be an option if you are buying new or approved used and intend to keep for more than say three years. It’s the one major let-down with the whole Mazda MX5 experience and it remains a mystery why Mazda UK have not lobbied to get a better treatment done to the underside for UK-bound cars from the factory. ND2 cars may be better according to some reports but this is not definitively proven, only time will tell how they fare after a few more winters.
Is it just MX5’s or all Mazda cars?