Underseal or Raptor?

[marlinspike]

Gravitex is overpaintable.

Actually yes you're right, it is. Not sure I would want to though as the finish is textured. As I understand it, it's meant to replicate the rubberised finish you can get on older cars.

 

[RaceDiagnostics]

I wouldn't use gravitex and not overpaint it, is is designed to mimic the OEM texture but not colour.

 

[norsa]

As above. I would imagine, unlike raptor it's porous without topcoat
Nick

 

[Roberto]

I stripped all the old rubberised stuff from the rear wheelarches then applied Jotun and Raptor. Car now sounds like a tin can. Had to install sound deadener mat and closed cell foam on the inside of the arches. Still a bit tinny but better.

 

[bert]

I have used Raptor and Mipa protect on the underside of the Mini's i restore. Both are overpaintable and none of the cars I have done have had the paint crack or chip easily.

 

[T5FAU]

Ive heard some very good review of a similar 2k polyurethane named Cobra bedliner, good price too and tintable with top coat. Its what i plan to use over epoxy primer for the whole underside of my project car when the time comes. https://refinishsystems.com/product/novol-cobra-truck-bedliner-kit-gun-colour/

 

[MJA]

I've used Rusts epoxy primer (2 part mix) and gravitex. Very happy with both products. Gravitex is grey like primer (i think you can get black as well) so needs overpainting. It looks factory in texture.

 

[vw1]

Just jumping in. I myself was after the upol raptor tinted but can not find a supplier that can do the tint. As if correct with this brand you can't just chuck in your own basecoat .

So am interested in the brand you mentioned above.

 

[bert]

Oxford carcpaints do the tintable raptor or Mipa protect. We just put the 2 pack base coat in it.

 

[Burdekin]

I've used Rusts epoxy primer (2 part mix) and gravitex. Very happy with both products. Gravitex is grey like primer (i think you can get black as well) so needs overpainting. It looks factory in texture.

I have a guy in media blasting my car and he’s not liking the gravitex at all. It’s not going anywhere and he’s using glass media.

 

[MG David]

I bought tintable UPOL Raptor and tinted it with base coat as per the instructions that came with it. Very easy to do and effective. The instructions also cover tinting by other means.

 

[qwakers]

Just jumping in. I myself was after the upol raptor tinted but can not find a supplier that can do the tint. As if correct with this brand you can't just chuck in your own basecoat .

So am interested in the brand you mentioned above.

yes, any solvant based basecoat can be used to tint raptor.

thats from raptors own instructions.

 

[The Z'eer]

Fully agree with @RaceDiagnostics
I also don’t like hard coatings under a car and prefer the rubberised ones, because that’s what the manufacturers use and I think they will provide more (or at least, some) sound deadening.
A lot of the stone chips dry hard and the Gravitex certainly does.
Two that don’t are SikaGuard 6440 and Dinitrol 447.
Wurth also do a rubberised coating that sounds promising but I haven’t tried it yet.
The best, allegedly, is the 3m 2 pack stuff but it is hugely expensive for what it is and it contains isocyanates. Also I’m too cheap to spend the money on it.
I have just used a tanking compound made from recycled tyres on a civils project that stays flexible and is hugely tough, which I might try it out on my next project.

Agreed, a soft coating minimises impact from debris/stones which the underside could see a fair amount of. Raptor is and was designed as a bed liner NOT an underside coating such as 3M Body Shutz, Dinatrol 447 etc.

 

[Craig-SM]

I've got gravitex under the wheel arches and raptor on the bash plates, wheel mount and towbar bracket on the Shogun. No problems with either for chipping or peeling, although I would say gravitex is softer so more flexible. It’s also much easier to apply too

 

[MJA]

I've just applied Gravitex with a layer of Dinitrol over the top. Happy with the results

 

[marlinspike]

One of the reasons I went with Gravitex was how easy it was supposed to be to spray on. I used a 24 litre Aldi compressor and a cheap shutz spray gun and it went on really smoothly and accurately with no overspray at all. One bottle goes a surprisingly long way too.

 

[Exuptoy]

Redirecting an old thread, just bought 6 tubs of black Gravitex with an applicator gun (can’t find mine!) for £48 on the bay of flees.
Used it on my lads seat after I did all the welding on it two and half years ago and it’s still looking good. I sprayed it over Bonda red oxide style zinc rich primer then and my only complaint was I hadn’t let the primer fully dry where it had coated in the seam sealer and had minor reactions in places but I was rushing it to get done.
Looked good once finished and still in good order now.
Inside the sill cavities was done with Bilt Hamber S50 Dynax as he was getting rust staining under the car after heavy rain as I’d not coated some of the welded in panels inside the sills. That stopped immediately after.
You can just see the reaction in the last pic.