What product to use to seal around block off plate? (pics inside!)

[Ansky]

I pulled my surround off to check the status of my block off plate and a lot of the sealant I used has cracked and crumbled off. I used both Fire Block and Funrnace Cement, and both cracked. I was thinking about using that Hi Temp silicone Gasket maker, but I wanted to check with you guys first. I thought that might be better because it is more pliable. What do you guys think?

 

[mellow]

Stuff Roxul on top of the block off plate and around the liner as it goes through the block off plate.

 

[Ansky]

Yes, I have lots of Roxul above the block off plate...Stuffed up as high as i could reach. I'm more concerned with what type of sealant to use where the block off plate meets the brick and the liner. And where the liner meets the stove.

 

[mellow]

I use mill-pac. My only issue is I have to reapply it after I clean my liner, the vibration makes it crack and fall off just like you show in your picture.

 

[begreen]

How large a gap are you sealing? If under 1/2" try mil pac sealant?