Which Undersealant and is it worth doing - Page 2 - Renault Forums :: Independent Renault forum

Bodywork Paint care, corrossion, body kits, spoilers, skirts etc.

LinkBack Thread Tools Display Modes
post #6 of 12 (permalink) Old 13th October 2010 Thread Starter
Join Date: Dec 2009
Posts: 62
Nominated 0 Times in 0 Posts
TOTW/F/M Award(s): 0
Thanks: 12
Thanked 2 Times in 1 Post
Re: Which Undersealant and is it worth doing

Yes I have used Old engine oil for some of the chassis components, but being very careful not to get this on rubber or plastic, I just rubbed it in with a cloth.

So that explains the price difference between the Tetrosyl Tetra Schutz 1 litre for 3.60 and the Waxoyl 6 1 litre.

I have done some research and the Tetrosyl, although sounds good is made from bitumen, which how you say, could peel away and trap water underneath it.

I'm tempted to leave until rust does occur, then sand and apply the normal Hammerrite Black 5 year paint you apply to garden metal gates?
danjoe is offline  
Sponsored Links
post #7 of 12 (permalink) Old 13th October 2010
Platinum member
bobbydog's Avatar
Join Date: Jan 2010
Posts: 8,987
Nominated 0 Times in 3 Posts
Nominated TOTW/F/M Award(s): 2
Thanks: 242
Thanked 421 Times in 383 Posts
Re: Which Undersealant and is it worth doing

'Hammerite underbody seal with waxoyl' costs around 5 a litre.
I've had the same tin around 5 years applying 2 generous coats yearly & there's still around 1/3 of the tin left!
As i said earlier it won't peel or drop off if apllied correctly though it does resemble & feel like its bitumen based.

Currently in bobbydog's garage:
MkI Megane 1.4 16v
bobbydog is offline  
post #8 of 12 (permalink) Old 13th October 2010
Platinum member
nobby's Avatar
Join Date: Sep 2006
Posts: 1,299
Nominated 0 Times in 0 Posts
TOTW/F/M Award(s): 0
Thanks: 1
Thanked 0 Times in 0 Posts
Re: Which Undersealant and is it worth doing

Bilt Hamber products are excellent.

As before, make sure you remove any loose or blown area's and apply. Bitumen based products are ok so long as you have a sound base to apply to. If in doubt don't go near it or your car will rot from inside out
Currently in nobby's garage:
used to own a 2002 laguna dynamique 1.9dci / BMW 525i SE Touring 2001/ Citroen SM EFI 1973
nobby is offline  
post #9 of 12 (permalink) Old 13th October 2010
Technical Supremo

Join Date: Feb 2007
Posts: 42,940
Nominated 16 Times in 67 Posts
Nominated TOTW/F/M Award(s): 28
Thanks: 372
Thanked 5,201 Times in 4,712 Posts
Re: Which Undersealant and is it worth doing

One of the big advantages of Waxoil i sthat it can be thinned using standard white spirit for easy spraying - even a garden sprayer can handle it.

Also you can spray it around the metal ends of brake flexi-hoses without fear of damaging the rubber parts. As anyone has worked on older cars will know the metal ends of flexi-hoses are prone to corrosion. As it's translucent when applied it won't hide any areas which require inspection during MOT.

Many years ago I remember seeing a simple de-watering test using two sheets of steel both with similar light rusting. One was coated with Waxoil the other in plain old clean engine oil . The sheets were positioned at 45 dgress to the vertical. Water from a watering can with a rose fitted was used to apply 1 litre of water to each. Guess which one repelled the water quickest. Any globules of water left on the Waxoil treated sheet were very small indeed and therfore were more likely to evaporate the faster.
Whilst Waxoil is more expensive it takes less to do the job and can beasily sprayed inside cavities and doors if required and doesn't block any vital drainage points. Clean up is easily done with basic white spirit. The hardest part is coaxing the stuff out of the tin.
Currently in madnoel10's garage:
Honda Civic 1.4l
madnoel10 is offline  
post #10 of 12 (permalink) Old 14th October 2010
Diamond member
Smokingman's Avatar
Join Date: Feb 2010
Posts: 305
Nominated 2 Times in 4 Posts
Nominated TOTW/F/M Award(s): 3
Thanks: 0
Thanked 57 Times in 53 Posts
Re: Which Undersealant and is it worth doing

Hi to everyone.

Waxoil mixed 50/50 with white spirit and spayed with garden sprayer sprayed into all cavities and exposed body work. Waxoil uderseal all underneath of car repels water and grud like no tomorrow.

All cavities on my 91 Accord spayed from new every other year, under seal done last year as origional begining to peel off. Again underseal can be thined with white spirit.

Currently in Smokingman's garage:
2002 Renault Laguna initial sport tourer-poorly, Honda Accord Tourer 2008 Dtec EX
Smokingman is offline  

undersealant , worth

Quick Reply

Register Now

In order to be able to post messages on the Renault Forums :: Independent Renault forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome