8 replies to this topic

[I hate Brian]

Hi all,

Anyone recommend a decent paint on underseal please with good results ?

[finch661]

i use TetroSyl (think you can get in in a tin to brush on), before i bought my compressor i used this: http://www.halfords....derbody-seal-1l

 

 

basically an underseal agent with waxoyl in it. means it doesn go brittle or crack. used this for about 4 years and happy with it, then bought a compresser so i can spray it on :)

[AVV IT]

I wouldn't really recommend bitumen based underseal, they were okay products in their day, but for corrosion protection there are far better/more advanced products available these days. The issue with underseal is that for some reason it has a tendency to trap moisture behind it, allowing panels to rot silently away and hidden from view. There have been many examples in the projects section here, where mini owners have stripped away thick hollow sounding areas of underseal, only to find no metal left behind it.

You can acheive far better under body protection by using a variety of different products built up in layers. Personally I use etch primer on bare metal, then a good zinc or epoxy primer, followed by stone chip, then a body coloured top coat, followed by an anti corrosion wax such as dynax. This is of course more costly and time consuming than just chucking on a coat of underseal, but it's going to be much longer lasting and much less expensive/ time consuming than replacing metal will be.

[I hate Brian]

Thanks for the replies gents, would you not apply the zinc first to the metal work rather than  the etch primer ??

[castafiore]

I think the theory is that etch primer grips the metalwork better than a zinc primer would. I get the impression many people have moved from etch to just using a good 2k epoxy primer these days though as epoxy doesn't absorb moisture in the way that other primers do.

Worth mentioning that not all underseal/shutz coatings can be top coated. The 3M one can't but Gravitex can.

[AVV IT]

Yeah, the zinc/etch thing is a bit debateable. Zinc primer will always work best on bare metal, as the idea is that it's a sacrificial coating, but then I'm reluctant not to always use etch on bare metal first because of the way it binds/etches to the surface of the metal and is therefore responsible for every layer you put on top of it not coming away. As above though, epoxy primers do seem a more popular alternative these days, but then they tend to be 2k products, so I'm a bit warey of using them for safety reasons, even if I'm only brushing the stuff on.

Worth mentioning that not all underseal/shutz coatings can be top coated. The 3M one can't but Gravitex can.

Good point, also that the Tetrosyl one has a habit of reacting with other products beneath or on top of it, unless you apply it very thinly and allow it a long time to dry out/cure.

[I hate Brian]

Interesting thank for the replies will have to do a bit of researching on the actual product compatibility

[Bubblebobble]

Have a look at the dinatrol range of products , they seem to be very well regarded .

 

http://www.dinitrol.co.uk/

[I hate Brian]

Thanks again