Footwell still leaking

[TerryTheToad]

1. My model of MX-5 is: NC 2008
2. I’m based near: _Beccles
3. I’m looking for technical help or recommendations on: Driver footwell still leaking after using silicone on the wiper/scuttle board screw hole

[Dipstick]

Did you completely remove the white insert where the securing screw fits. Needs to be taken out, cleaned, silicon administered, replaced, more silicon spread around fitting and a dob where the screw will be inserted.

[Wilier1]

I had 2 attempts on my Sport Black with removing, cleaning and using silicone sealant, which still leaked, due to temperature change and I can only assume a small amount of flex in the metal after hard driving.
This caused the silicone to break the seal.

To get around this, I used Plumbers Mait from Screwfix, which is a non setting waterproof putty for pipework.
No problems for 3 years now!

https://www.screwfix.com/p/evo-stik-plumber-s-mait-750g/14477

[Dipstick]

SikaLastomer 710-310 ml Black Sika Lastomer 710, Removable Butyl Sealant, 300 ml, Black : Amazon.co.uk: Beauty
I use this sealant. Stays tackie and does not crack. Also used it to seal high level brake light. Can be removed if necessary.

[TerryTheToad]

Thankyou for your replies . This’ll be the third attempt so I’ll try the sealant suggested and hopefully that’ll sort it

[TerryTheToad]

Thankyou , I’d not put sealant in the screw hole either

[Mister_H]

You could take a look at my recent thread

Water Ingress Mk3 - Not the grommets

Out and about in the NC1 at the weekend, having just released it from hibernation, only to collect a stone at the base of the windscreen which quickly turned into a crack across the middle of the windscreen. So, with only a week before a trip to Germany, I quickly booked a windscreen replacement. [Windscreen] As it turned out the windscreen fitter was a fan of the Mk3 and very knowledgeable so we had quite a chat. Apparently he has replaced many Mk3 windscreens with owners thinking that wat…

might be worth sealing that area as well

[coconino]

When you sealed the grommets, did you lift/remove the black plastic panel infront of the windscreen on your car, not just the thumbnail size screw covers?

“Driver footwell still leaking after using silicone on the wiper/scuttle board screw hole”

Your words make me think that you are not doing the job correctly. Do a search on YouTube to watch a video on how to do this job and verify you have sealed the grommets below the black plastic panel and not just sealed the screw hole under the small screw covers.

[TerryTheToad]

Apologies I wasn’t clear on the initial thread , I have taken the whole plastic trim off, removed the square plastic grommet bits and sealed it.

[TerryTheToad]

Interesting, thankyou for the heads up , I’ll have a look at that area too