Choosing the Best Caulk Caulk Bottom Line Use GE Silicone II if it's in the tub or shower, or if it doesn't need to be painted. Latex is easiest to apply and cleanup. Butyl rubber is dead last.
Silicone is essential to seal around bathtubs, showers, lavatories, etc.
There's special bathroom caulk for this that has a mildewcide. This poison has been known to be hazardous if used inside dishwashers because the high heat outgasses the poison onto the dishes and is then eaten. THAT well known consumer product rating magazine last rated caulk in 1993. Every brand had caulks that scored throughout the range from good to bad. It's an elastomeric latex sealant.