[Jims5543]

Try to use a shop vac to suck the JB Weld into the pores.

In my RX-7 I opted to port the intake ports aggressively, this meant we would touch into the water jackets, well... my mechanic got a little too aggressive with the porting and we made some nice size holes int he jackets.

He tried all kinds of space aged, fancy, expensive, epoxies etc... every one failed. We used JB weld and it is still holding strong 10K miles later.... and lots of abusive driving.

He used a shop vac to pull the JB Weld into the joint so it seeped through and was not just on the surface.