exhaust manifold gasket sealing

[70 tt rustang]

I have a gasket leak the shop that did the work used some kind of sealant on them now i have to clean it up and put new gaskets on the gaskets were felpros and the correct size wide bolt pattern for dart heads. Should i used some kind of sealant again and what kind and on both mating services? Iam a little lost here
thanks

[TheJDMan]

There should be no need for any sort of gasket sealer on header gaskets. I have been using Percy's dead soft aluminum gaskets and have had no leaking at all.

http://www.summitracing.com/search/brand/percys-high-performance/product-line/percys-seal-4-good-header-gaskets?autoview=SKU&ibanner=SREPD5

[70 tt rustang]

Thanks