Nah.
But he would have hard time dehydrating him. Namor has 60+ years of experience fighting the BOTH Human Torches, and Sunfire. Thing's power alone would not be enough to beat Namor, and I think that Super Skrull is not as strong as Thing...Namor's beaten Reed more then once. But Invisible Woman's powers, combined with others should do the trick, since Super Skrull would use them lot more lethally then the FF have ever used.
But it won't be 10/10 to Super Skrull, Namor has fough the entire Fantastic Four and fared well. Plus, Namor is IMMUNE (this is true, if anyone wants scans I can show them) to hypnosis, and is faster and physically stronger then Super Skrull.
But Super Skrull would have 6/10. Just because he is so versatile.
Of course, if Namor uses cheap tricks, he could always electrocute Super Skrull.