akmacmac t1_j2bmxt1 wrote on December 31, 2022 at 1:28 AM

Reply to comment by ShewTheMighty in What shower caulk to fill a wide (1/2") gap by climbtigerfrog

This is a great post, but Alex Flex is not the right stuff for this application. Alex Flex is a siliconized acrylic latex meant for painting projects. It’s not supposed to be in wet areas. The only thing I’m aware of that should be used here is 100% silicone.

ShewTheMighty t1_j2cmgs9 wrote on December 31, 2022 at 6:30 AM

Fair point. The 100% silicone is the best option. Honestly never paid attention to the fact it was a mix. Alex Flex is commonly available, "100% waterproof" (when not submerged), and often cheaper though.

Since the area in question is above the tubs water line it would do the job fine but you are right, 100% silicone is better so long as you don't want/need to paint the area.

8Julio8 t1_j2bqddk wrote on December 31, 2022 at 1:54 AM

Some Siliconized acrylic latex is rated for wet areas. Any tub and shower caulk that’s not 100% silicone will probably be siliconized acrylic latex.

akmacmac t1_j2brnzw wrote on December 31, 2022 at 2:04 AM

That’s true, and they’re definitely easier to work with, but Alex Flex is definitely not the right thing to use here. If not pure silicone, should definitely be using something that states for use in tubs and showers for this application.