A/C Troubles

[gpdriver21]

I got a 95 Grand Prix SE (110,000 miles).
My A/C system leaked out towards the end of last summer. Now that it is starting to get hot around where I live I decided to try and fix my A/C this past weekend. I tightened all the connections on the hoses and on the compressor. I then refilled the system and added leak sealer and leak detector.

Today my A/C wasnt getting as cold as it was the past few other days. I decided to hook the guage up to the low side and noticed it dropped a few psi since I recharged it. I have be looking for any signs of the red dye leak detector and cant find any.

Any ideas of where the leak might be? Where are the common places that A/C leaks occur?

Thanks!