i have searched and researched

for the last 4 or so hours and am really confused. I am installing a thermostat on a 1994 c280. i want to make sure to have everything i need before i start. I see many posts that call for loctite 5900 sealand or even 5970. i have also seen something called permatek "right stuff." I called the dealer and they brushed me away from the purchase of the mb brand sealand because it is $39 for a small tube and was referred to pep boys to find a permatek brand (nice, what an awesome salesperson... if i were his boss

i would have fired him

... there goes his comission..hehe) what should i use for the sealant

?
thanks
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1994 C280
2009 VW Tiguan
1993 Toyota X-tra Cab SE-5
1973 220D

... Gone, but not forgotten
1991 Alfa Romeo 164L

Gone, wife MADE me forget it
2006 Hyundai Tucson... just straight out FORGOTTEN!