Preservation tape on hul damage
So over the weekend I glanced a buoy in my Tartan 30 and put a small gash in the hull. About a foot long, well above the waterline, but the fiberglass did slice through. I plan to have it professionally repaired correctly, but I was planning to haul the boat out next Spring for bottom paint, through hull work, prop bushing etc., so I'm not real keen on taking her out of commission right now in the height of sailing season. Several repair outfits have recommended that I patch the gash with "preservation tape" till I'm ready to haul out.
What do you all think of this? Will preservation tape keep things water tight for a few months? The slice is high and forward enough to where I can't imagine heeling enough to submerge it, but I'd still like to know it will be waterproof till we haul out.
Also, what sort of surface preparation should I do for the tape? Just good cleaning? Sanding to rough it up? Sand through gel coat?
Thanks for any advice you can provide.