I followed the instructions that came with the spartite. 
It pours easy and is self leveling. Short pot life. Max 10 minutes..

I put tape around the edge of the partners so the hardened spartite is over the top edge of the partners and should be watertight there. 

After lining up the mast with short wedges, I built a dam from below with supplied foam rolls and modeling clay. Then I poured the fluid spartite between mast and partners up til the wedges. Let that harden up. 24 hours later I removed the wedges and made the final pour. 
Total height of the spartite wedge is 7,5-8 cm. 

the Weicon 85 was not as fluid and more difficult the use. Not such good self leveling properties, but longer pot life to work it in place.  

Wow!

She looks sturdy and beautiful….

I like very much the daggerboard too.

Looking forward to see her on the water and hear how she sail!!!

Congratulations Frederik 

Very impressive, indeed!

Now that's a sturdy mast partner! Is it aluminum? Did you lasercut the reinforcement plate, which is welded to the base plate of the mast partner?

Now with masts alligned and installed. 

I used spartite between the deck partners and masts, permanently attached to both, and  weicon shore A85 as a wedge between mastfoot and the mast, attatched only to the mast. 

It’s been a bit of a head scratch to get this part of the build right, with the different angles and all the lifting in and out of the boat, but it turned out fine. 

The scariest part of the whole process was when the main would not readily slip the butyl tape that was underneath the flange of the partners.  
but with patience and hobby knifing the whole lot came off. 

Butyl tape may not glue, but it surely sticks…

Looks great, Frederik!