I have a custom that wants the “formula” to flow through the nipple. No hole nipples would not be ideal in this situation bc they won’t fit the bottle.
I’m interested in suggestions where you’ve been able to send a leak-free bottle. TIA
She wants the formula to flow through the nipple? You mean go all the way to the tip, but not come out, right?
I make my own by turning the nipple inside out and applying silicone sealant (I’m not home, can’t look, but it’s something for RVs, I think) with a toothpick, letting it dry, then turning back the right way. You can hardly see it. I add “formula” then glue it together.
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I do the same. I usually only use the yellow nipples because you can’t see the sealant at all. If it takes a specialty nipple then I just use the original one.
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Yes that’s correct. I’ve been so worried about silicone becoming dislodged. Yes when you get a chance let me know what kind so I can get some and practice.
Thank you 
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Yes it’s a specialty nipple otherwise I’ve just used the no hole nipples, but this one is different.
I use clear silicone and put it in the end of the nipple. I touch it all the way up to the top and squeeze so that it fills the hole as well. Not sure if that is making sense or not.
I think this is the stuff I have
https://www.walmart.com/ip/Silicone-2-Window-Door-Caulk-Clear-2-8-oz/19902081
I have a bottle that has been sealed with this for years and it’s just fine.
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I use the DAP as well.
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Thank you everyone. I plan on buying both kinds and doing test runs before I send the bottle off:blush: