I've been trying to find a particular post lately, but I haven't had any luck. I remember that it was a woman being covered in/transforming into slime or some kind of suit. She was turning red, and had a white cross on her chest or stomach. You could see the sihlouette of her breasts through the red goo. If anyone knows where I can find this, any help would be much appreciated

Try using multiple tags in your search. For example, you could try "female transformation slime breasts" or other such tags, and see where that gets you.
Just remember to seperate each tag with a space (ex: female breasts). Or, if you are using a tag with multiple words, seperate each word with an underscore (ex: large_breasts).

Dont forget to eliminate tags with putting - before them

And are you sure it was on this site, or was it just in general?

I could have sworn it was on this site. I spent about 20 minutes trying different tags to find it and no luck. It's gonna drive me crazy till I finally find it again

I hope you find it

Same