My boat had previously been a nothern fresh water boat and it had not had any significant blistering problems. The bottom actually had very little ablative left on it when I purchased it. Gel coat crazing, below the waterline, was my primary issue. Rather than build on a bad foundation, we bit the bullet. We sanded away some gel coat thickness and built a substantial thickness of the Interprotect. The epoxy filled the crazed zones that remained post sanding. The Interprotect epoxy seems to have more than reasonable toughness post cure. It adheres well to the gel coat. The toughness seems to be more than adequate to suppress propagation of the remaining underlying craze marks in the gel coat into the epoxy barrier coat. Given there are modulus and CTE differences between the polyester/glass laminate, the gel coat and the epoxy barrier coat the performance of the product is noteworthy.
If you don't have any problems below the waterline, I agree, the bottom is not something to do for the entertainment value. Messy, time consuming and expensive! For anyone who is considering, the one recommendation that I would make is to follow the manufacturer's recommendations on build thickness. 10 mils (0.010 inch thickness) takes several coats to achieve. A sheet of paper is 2 to 3 mils thick, so 10 mils is a lot of thickness to build by rolling or spraying. For what it is worth, we used Petit Ultima SR copolymer and it adhered well to the barrier coat. We try to not overdue in repainting the ablative, generally only touching up the higher wear zones created by the blazing speeds achieved in sailing in 3 to 5 knot winds in the Western Long Island Sound on a sunny weekend afternoon in July and August (known locally as the bob and fry.) No big adhesion problems in the build-up of the ablative. For Starship Enterprise, which is about seven miles west of me, water quality is similar (high nutrient content) so what we see in Hempstead Harbor may apply. People seem to have good success with the Micron CSC. I have had good luck with the Petit Ultima SR 40 and now 60. For those that have the bottom scrubbed every two weeks the high end hard epoxies (VC-17) work well. I chose ablative as just can't hold my breath as long as I could when I was younger. Hope this helps. Kirk Sneddon Flying Cloud C&C 29 Mk II From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of dwight veinot Sent: Saturday, January 12, 2013 6:36 AM To: cnc-list@cnc-list.com Subject: Re: Stus-List Barrier Coating after Soda Blasting I am not aware of any C&C boats that ever had blistering (osmosis) problems, at least around here.maybe there are more such problems in southern waters.so I can't justify the effort and expense of the Interprotect system.maybe if I ever did a total bottom paid removal I would consider going overboard and apply Interprotect then as a tie coat for new antifouling paint Dwight Veinot C&C 35 MKII, Alianna Head of St. Margaret's Bay, NS _____ From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of kirk sneddon Sent: January 11, 2013 10:46 PM To: cnc-list@cnc-list.com Subject: Re: Stus-List Barrier Coating after Soda Blasting Did the bottom of my boat six years ago when I purchased it. We did 2 coats of the high build primer (I think the designation is Interprotect 3000) followed by 3 coats of the Interprotect 2000. It is a good product line. The key is build thickness. If you don't get enough thickness the epoxy will not be effective as a moisture barrier. With proper build thickness, the stuff works as advertised. I have seen other boats where people tried only 2 layers of 2000 and the results were not so good. Don't try and save on materials. I had gel coat crazing (too thick from factory) prior to doing the bottom. After six years the bottom looks great. No blisters, no evidence of propagation of the gel coat crazing under the barrier coat. I'm sure the fish are impressed when they swim under it. If you get a good prep on the underlying surface and follow the manufacturer's instructions, you should be very happy with the results. Kirk Sneddon Flying Cloud C&C 29 Mk II From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Edd Schillay Sent: Friday, January 11, 2013 10:48 AM To: cnc-list@cnc-list.com Subject: Stus-List Barrier Coating after Soda Blasting Listers, I'm getting the hull of the Enterprise soda blasted this year and the plan is to do the barrier coating myself afterwards. So, a few questions: 1. I've heard Interprotect is a good product. Anyone have any recommendations? How many gallons for a 37+'s hull? 2. How many coats should I put on? I like the idea of alternating gray and white. 3. What is a good way to get it all on? What is the best painting materials? Please note: I'm not looking for the ultimate super smooth bottom. I'd rather not spend days wetsanding this hull. 4. Any other tips or suggestions? The Enterprise launches in 17 weeks. All the best, Edd Edd M. Schillay Starship Enterprise C&C 37+ | Sail No: NCC-1701-B City Island, NY Starship Enterprise's Captain's Log Website <http://ncc1701a.blogspot.com/> _____ No virus found in this message. Checked by AVG - www.avg.com Version: 2012.0.2221 / Virus Database: 2637/5525 - Release Date: 01/11/13
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