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Thread: Underseal service recomendation

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    Work... what work? Club Member Scott-tt's Avatar
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    Underseal service recomendation

    I want to get my supra undersealed does anybody have a good recomedation I want to find someone who's going to treat any existing rust and do a really good job I'm in Scotland but don't mind travelling for a really good job

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    Work... what work? Club Member Scott-tt's Avatar
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    Quote Originally Posted by AC93 View Post
    Thanks that sounds perfect

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    My recommendation would be don't do it.

    I've had and seen enough older cars where the underseal has either failed or trapped in live rust that it really is something I now avoid like the plague. If you paint a surface or coat it with corrosion preventive then you can see if rust occurs or reoccurs. If you underseal or raptor coat then its out of sight is out of mind.

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    Trigger Happy Moderator Tyson's Avatar
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    Quote Originally Posted by rider View Post
    My recommendation would be don't do it.

    I've had and seen enough older cars where the underseal has either failed or trapped in live rust that it really is something I now avoid like the plague. If you paint a surface or coat it with corrosion preventive then you can see if rust occurs or reoccurs. If you underseal or raptor coat then its out of sight is out of mind.
    What do you recommend ?
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    Quote Originally Posted by rider View Post
    My recommendation would be don't do it.

    I've had and seen enough older cars where the underseal has either failed or trapped in live rust that it really is something I now avoid like the plague. If you paint a surface or coat it with corrosion preventive then you can see if rust occurs or reoccurs. If you underseal or raptor coat then its out of sight is out of mind.
    I agree with rider on this point��

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    I'm addicted now! Club Member shaky's Avatar
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    Quote Originally Posted by rider View Post
    My recommendation would be don't do it.

    I've had and seen enough older cars where the underseal has either failed or trapped in live rust that it really is something I now avoid like the plague. If you paint a surface or coat it with corrosion preventive then you can see if rust occurs or reoccurs. If you underseal or raptor coat then its out of sight is out of mind.
    Did mine 10 years ago, had no problems, but it's not seen rain in 10 years

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    Simon_RD Club Member Simon_RD's Avatar
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    Its a bit of a tough decision.

    Rider is right, in that its not unheard of for people to get their undersides sealed up, and actually trap rust in, which can't be easily seen going on, and cause's bigger issues later.

    Of course, the flip side is also true - if you don't do anything to protect the underside at all, and just leave it to chance,.. well then, obviously your unprotected, and rust is very likely. A underseal now, may prevent a much much more costly job later.

    Catch 22.



    I'd suggest put it up on the ramp, get a supra guru to go over it in some very serious depth and put it in a spotless state first before considering under sealing (obviously however, that might add on reasonable cost.)
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    Helpful Club Member Scooter's Avatar
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    Quote Originally Posted by Tyson View Post
    What do you recommend ?
    You could go with pressure wash, steam clean, removing bits that are easy (exhaust, exhaust heat shields, tunnel braces exhaust hanger bracket, tow hook tank guard etc), elbow grease in the hard to reach areas. You will gather the general state from the bits you take off and what you then uncover, as generally how often do we really examine underneath?

    I did this almost two years ago with one of mine, it was in good enough shape and I didn't plaster it with anything in the end, some dinitrol greasy stuff (under hockey sticks and rear brake duct/vents, I coated the tunnel braces in dinitrol under seal type stuff and por15'ed the exhaust heat shields and fuel tank cover. Also sprayed some acf50 around some places.

    I had a little look under the other day and may strip it again to see how it's faired.
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    Quote Originally Posted by Tyson View Post
    What do you recommend ?
    I'd use POR paint or aquasteel on a prepped surface followed by zinc primer and a matt black or OEM colour paint. For tubular parts or hard to get to parts I spray Dinitrol 3125 which is a wax film corrosion preventive. That way you can see what is going on with the smooth top coat or wax film to know what is going on underneath.

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    Ride Or Die Club Member Supra-love's Avatar
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    Got to say I’ve seen quite a few underbody restorations where they cover nuts, bolts, rubber grommets and even some of the lines.

    Which just hides things and makes things more difficult to remove later on although mine didn’t have rust anywhere, I made the decision just for extra protection long term, although it’s never used in the wet etc, I decided I wanted it done.

    I’m currently having my complete underbody restoration finished off now by little Num

    Will start a thread on the project with all the pics once complete
    Last edited by Supra-love; 02-06-19 at 16:01.
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    The Non-PC Club Member Frank Bullitt's Avatar
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    This is how to do an underbody restoration - http://www.mkivsupra.net/vbb/showthr...ec-Restoration

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    BPU happy Events Organiser Shane's Avatar
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    Quote Originally Posted by Scott-tt View Post
    Thanks that sounds perfect

    It did for me too and maybe this is nothing, but may be worth checking out:

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    Unless you are going to drive it regularly in rain and particularly on winter salted roads I would not do it. Having said that (noting that you want a good job) doing it properly is not cheap as there is a lot of labour involved.

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    I have a UK car which has had to have a fair bit of work, stone guards replaced etc. I too share the concerns that a hard coating/paint can do more harm than good as it can trap moisture accelerating the rust and keeping any corrosion from view.

    My regime now is to apply some of this every year or two to the whole underside and spray into cavities and gaps. https://www.amazon.co.uk/gp/product/B0035KKK66

    These creep oils get into everything and displace any water, the down side is that as they are a bit thinner they will eventually wash off.

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