Today I mixed up some CS-1900 firewall sealant. This stuff is about the consistency of Silly Putty in the can, so I mixed it with laquer thinner to thin it out. It took about 15 minutes of mixing before I could spread it on the sheet. | |
Here's the goo spread on the target sheet. The stuff wasn't setting up very fast, so I put it in the oven on warm heat (~250 degrees) to speed up the process. | |
While that was curing, I unpacked my antennas from Delta Pop Aviation. I met the fellow who runs this business at Oshkosh. He seemed knowledgable and his antennas are very competitively priced compared to the Comant equivalents. Pictured here are two COM antennas, a transponder antenna, and an ADS-B 976 MHz antenna. | |
Here's his info if you want to buy some antennas from him. | |
After letting the sample sheet sit in the oven for a few hours, it seemed pretty well cured, with only the thick areas being somewhat soft still. I hooked up the propane torch and fired up the rig. Within about 10 seconds, there was quite a bit of flame on the CS-1900 side of the sample. | |
...but that flame went out within about 10 or 15 seconds and then the sealant just sat there while the torch blasted away. No smoke...nothing. | |
Here it is after about a minute of torching. | |
The backside was glowing a nice cherry red. I think I'm going to redo this test, but allow several days for the sealant to cure. I suspect the flame was from leftover laquer thinner that hadn't cooked off in the oven. Although the results are inconclusive at this time, I decided to move forward with the plan of using CS-1900 to seal the screw holes. At some point I've got to move forward on these floors. | |
Out of curiosity, I decided to mix up a batch of proseal since I've heard of quite a few people using this instead of CS-1900. I'll give this a couple days to cure before testing it. | |
In the meantime, now that the shear holddown is installed, I started fabricating the brackets to hold the insulation to the floor. First was to cut them to width and length. | |
Then after deburring, I used my little brake to bend them up. |