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Use Sonneborne NP-1 to seal the seams. Comes in 10.5 oz. and 29 oz. tubes. Use a GOOD gun and you will have the most durable caulk you can use. Comes in several colors but limestone gray is your best match. Gun it out neatly as it is very sticky and hard to "tool". If you need to smooth it out let it skin over and use water to lube it as you tool. It will take 3-7 days to full cure. This stuff will not fail.
BTW,DO NOT use any silicone rubber caulk products-they will turn loose.
What do you recommend?