My cover on my 271 is starting to get moisture thru it and starting to leak.. any suggestions on a fix? i was thinking of laying it out and using a few cans of scotchguard. what do you guys think?

I was chasing the same problem. There really is no fix....I tried the waterproof sprays and really didnt do anything.......the material starts getting stretched and allowing the moisture to seep through. I had to go to my canvas guy and he made me a new one out or a GoreTex material......the water just beads rite off of it.....well worth the money and my interior stays dry.

What does something like that cost to have a new snap cover made?

I've used Starbrite canvas water proofing liquid and it works great. You have to soak it pretty well and let it dry over night. Water beads off for at least two months. It's a bit pricey but not overly, I think like 25 bucks for a gallon. Best to spray it on nice and even. Unless your cover is absolute junk, it should work well for you. You'll need the whole gallon for a cockpit cover on a 30 footer.

I'll second this one. I did the cover on my Velocity a couple times over the years with the Starbrite product. 32 footer used up pretty much the gallon. I used a small garden pump type sprayer, fine mist and go over it in both directions.

Do you guys spray both sides of the cover?
where do i get this spray from?

No, just spray the outside. Clean the cover first if it's real dirty. West Marine/Boat US carries it. Ragged's garden sprayer suggestion is a good one. I used a spray bottle and it was a PIA.

Thats why I do the thinking!

Just hang it over a clothes line or a rope between a couple trees and have at it.

ideally for best result with sunbrella the weave should be as "open" as possible just as it is when the water is seeping through ie: snapped on the boat with poles up this "tension" will make for a longer lasting result. good warm sunny day when the cover is "tight" installed

That definately makes sense spraying it while its tight but i dont know about spraying that stuff while the cover is on the boat. I'll probably just lay it in the yard and hopefully i have enough stuff for 2 coats