Quick question..Why is the transparency not setting it to what i want it to be for this part..?

So, before you downvote this, please keep reading. (please do not downvote it)

What i want to do is when the player purchases something in a GUI (i already have a points script, the points don't matter now it's just about the current question) it makes a part transparent to about 0.6. So in that GUI whenever the player purchases the part, a number in the same GUI goes up by 1 and makes a part a tiny bit transparent, so what i tried was when the player made the purchase a number value goes up by 1 then when it changes to 1 a part goes transparent to 0.6. I tried that once and the part didn't show up. I tried ANOTHER strategy and it was when the value changed, it sets a bool value to true and when that it changed to true, it sets the transparency to 0.6, and THAT didn't work.

I know this is a stupid question but can you tell me what I'm doing wrong and/or if i should put in some code?

Thank you so much for you're help! I know anyone can answer this, so please do, it will be appreciated!

~Chez_Guy :D