I’ve had the liner in for a total of two weeks, and here’s my report.
- Don’t let it get too old. I’ve had this kit sitting in a climate-controlled cool, dark corner for two (three?) years while I got my act together to spray it in. In that time, the primer hardened to a solid in the bottles, the main component skinned over about 1/2″, and the black activator component looked like it was beginning to go bad. The folks at Al’s were very helpful and suggested I buy more activator when I ordered replacement primer. When I got the order they even threw in a spraycan of mold release, which helped when cleaning the spray gun out (the excess basically peels right out).
- Mix it really well. I used the mixing attachment they supplied with the kit, which probably works fine for brand-new materials, but I could have used something with a wider paddle to really get things mixed well. I sprayed the primer on the bed as instructed and then mixed the first batch of liner. When I test-shot it on some spare door panels, I got a white foam for the first 30 seconds or so and then the liner started coming out–some of the C component may have been bad as well. This was after 5 minutes of mixing. My liner looks good but there are little boogers here and there where the main component hadn’t dissolved all the way, and they’re still sticky.
- Dial the pressure in early. The pressure on my compressor was set very low to begin with (around their recommendation) and I got a very thick, gloopy spray at first. It was so bad that I was getting random puddles in different areas as I tried to clear the nozzle. I shot about 1/2 the hopper worth of liner before I got wise and increased the pressure, and at that point the spray went on smoother. I’d also recommend having a thick-nap roller handy to smooth out the puddles; I wasn’t thinking ahead that far but in hindsight it would have made a big difference.
So it’s in; I’m relatively happy with the results but I wish I’d had more time to experiment with the compressor and think through the application.