Paul_KD7HB:
I autopsied several of those little Chinese relays. The contact points are little balls of unknown metal. Sometimes they slide past each other, but still make a point contact.Real relays for the power you want to switch will have circular contacts rather large in diameter. When new the surface is slightly convex and will be silver or silver plated. As the arcing progresses over time, the silver will be worn away and the contact area will be more flat. Also gets flat at the contacts are burnished with maintenance.
Paul
Thank you for the info.I will go with beefier mechanical relays with contact pads as you describe them.I was really afraid these small blue compact Chinese relays are just...to small 
.Maybe good for demonstration purposes but not for every day use.
If i go down the SSRs route...because of my laak of knowledge is a bit hard to estimate how hot it will get.Do i need some crazy air assisted big copper sink capable of hundreds of watts of just one the size of the relay with no fan?
Sabin