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Wurth SKS Stoneguard is what I used several years back when doing the underside and fender wells of my car. It is water based so clean up is super easy, but you do need to buy the Wurth Schutz gun to apply it, which if I recall was around 100 bucks. For you, doing spot-repair matching, maybe it’s not worth it. The cans of SKS come in I think quart or liter sizes and screw directly onto the gun. The gun has an adjustable tip, to change texture. What I found is that you need to hold the gun tip quite a bit further away from the panel than you might think, to get the right looking texture. It does shrink a fair bit as it dries, so when you apply it, if it blends into the surrounding undercoating well, don’t stop there, add a couple extra coats so it dries to the same level/thickness as the original. It takes a LONG time to dry thoroughly. But it can be painted over.
Wurth also sells a Underbody Seal, which I think is not water based, but might also be appropriate. If you do searches on this subject you’ll find extensive discussion on which type is appropriate, which type the factory used for different years etc. I do believe Wurth also sells an aerosol version of one or both of these, which for spot blending would probably be better, but I’ve never tried them to know if they give a good/thick texture like original. Other brands of underbody texture I’ve used are utterly worthless from my experience.
The SKS dries hard as a rock, and really looks original if you do it right.
I haven’t used my Schutz gun in years but I still have it….I’d be more than willing to send it out to you to use if you don’t mind paying shipping and sending it back. Of course shipping being what it is these days may end up costing over half the price of a new gun. Something to consider anyways.
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