Weld-On #3 vs Weld-On #4

Tools, Techniques, and Reference Materials Tools
1

What are the differences between Weld-On #3 and Weld-On #4?

2

From a quick glance at the IPS Corp website the gravity is the only difference. #4 being lighter.

3

Weldon #3 is faster setting than #4. Here is a link for info: http://www.rplastics.com/weldon4.html

4

Weld-on #4 has more methal chloride in it than Weld-on #3,