Not sure if this has been covered, but for anyone interested, I left my foil assembled for a bit over 12 months. Never been washed either. It came apart with everything in as new condition. As per slingshot recommendations, every bolt was lubed with lanolin grease, wrapped in teflon plumbers tape, then lubed again. Every mating surface well lubed. The grease was starting to harden a little, probably could have pushed on for another 6 months at a guess. Cheers.

In that case I've over done it. Four times in seven months. I reckon that's got me at least a couple of Hail Marys for starters. I also have slingshot . Position C to an 84 wing. I found that unless the two bolts connecting wing to mast are very tight, they will loosen over an hour or two on the water. So no longer a problem there. The thing is, I use plumbers grey Teflon tape over lanolin coated bolts, wound tight, coated again, but the tape still rides up. Is the the norm or am I using wrong tape? I've wound tape in opposite directions but the outcome is the same.
Any help would be appreciated. Thanks.

Try the cheap thin tape, and maybe less of it. I just used the stuff that came with the foil, it's a lot thinner than the tape I use for the odd plumbing job at home. It rode up a little, but still covered.

Excellent. I will search for the very thin tape. Thanks.

I was surprised to see that slingshot gives in their kits a roll of gas type Teflon tape on a yellow spool versus the water type Teflon tape on a blue spool. The water type tape is single density. The gas type tape is double density in the US. I don't know about the rest of world. I have to order lanolin oil from the internet. I have to make a long trip for marine grease. But its only a short trip to the local auto parts store for silicon dielectric grease. In addition its only a few bucks for four ounces. Also what nice about the silicon dielectric grease is it's designed to prevent the flow of electricity. And corrosion is an electrical phenomena.

I coat the fasteners. Then tape them. Followed by another coat of silicone grease. Followed by a small amount if silicone grease in the inside threads in the aluminum foil mast and fuselage. When it come to tightening the fasteners I use a torque wrench and a torque chart from the internet for titanium fasteners. Its probably overkill, but everybody has heard horror stories of foils that wouldn't come apart.

Finally at the beach I'll occasionally check the tightness of the fasteners and I'm sure I go above the torque specs when I do that.

If you're not in salt water you can let foils assembled indefinately. On salt water no idea, wouldnt really try it just to be certain ;). Depends a lot on the materials and quality of anodizing tho.

I leave foils assembled forever with Tef-Gel. Then disassemble for shipping when I sell them. No problems.

It depends on the material (al vs. carbon) and the salt (salt water vs. see).

After letting him 3-4 days (greece, this summer) in the JP hydrofoil my 2019 NP RS Flight was completely stuck in the box.

Not even with 2 persons we were able to pull him gentle out of the box (after using teflon, graphite, WD 40 and many other things).

I hammered him out successfully later on ... never again.

Just my 2 cents worth, I put waterproof boat trailer wheel bearing grease on all bolts, leaving it together in my car for 3-4 months. When I pull it apart to clean and reapply there's no sign of corrosion at all.