quick acrylic adhesive question

[Steverino]

Whats the difference between Weld-On #3 and #4? I am searching and I believe one sets up quicker than the other, but that is all I can find.

[rigleautomotive]

the lower the # the thinner it is

[BrokeColoReefer]

The 4 has a longer set time. To tell you the truth i didnt see any noticable difference in consistancy. They are both super super thin. I have used both. I like three better, and its holding my 200 gallon tank together well. The 4 took about 3 minutes to cure and was super sensitive to cure time, weldon 3 took about a minute to cure and my joints came out much better.
The best advice is to buy both, and pratice. Then pratice some more, when you done with that practice some more.
I praticed about 100 different joint curing times and 3 different weldon products. Now i got it down.