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1st wurth makes nothing that porsche would use on there cars when they are built .
wurth is not a maker of there own products they are just distributors and put there name on other peoples products .
the SEM sprayable seam sealer you have is not used on porsches . sem has a gun to spray that product you will see that type of seam sealer on VW's / audi's along with cars like mazda 's .
SEM has a very good two part seam sealer you will need the SEM gun for it but the part number is 39377 seam sealer .
SEM also has a single part seam sealer that works good # 29372 all you need for that seam sealer is a run of the mill caulk gun .
what you want is a chip guard not undercoating .
we use the U-POL chip guard in my shops we have found it is a good match looks wise to the old porsche's 3M's beige . we also use it on the fuel tanks to match the color because it is tintable .
we also use the SEM pro-tex chip guard it's a top quality product that uses a catalyst (hardener) it does not have the same look as the old porsche chip guards but it's a beter product because of the catalyst .
when it comes to coating the floor we use SEM rust-shield . if you want it to be semi gloss black like the OE porsche pans are you use the flat black and add the sem rust-shield hardener to it mixxed 8 part to 1 part . it will be a dead nuts match to the coating porsche uses on there floor pans .
because it looks like your going to track the car i would not chip guard the floor pans . only the rockers i would chip guard . the reason is it's just weight that is not needed not that it adds much but non the less it's still added weight .
on the cars we build we remove all the chip guard and not add it . most of the time on a porsche it's about 11 LBS of chip guard on the cars .
the cars we build we look at removing grams not just LBS it's worth it in the long run .
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