Move blocking for bottom painting

I had MarineMax agree to have my 410 blasted last year as a condition of sale.
My surveyor recommended that it be done.
They had an outside Blaster come in and do it, then a few weeks (gave me time to go back up to Ct. to inspect it) later when the weather warmed up they barrier coated and painted with alblative.
When the boat got hauled and power washed in late November The bottom paint still looked nice and smooth with no bare patches on the hull.
Get it blasted and start fresh if you can. You won’t regret it.
 
I spoke to my boat yard. They will reblock the boat for me as needed.
 
An update with the results of bottom blasting which was done last week. It looks great with the crusty old bottom paint gone and sound gel coat remaining. The guy who did the work said the hull is in great shape and very solid; just a few scrapes and no blisters. The surface is not completely smooth but kind of textured from the blasting media. I expect that won't be a problem once I put on some epoxy primer and antifouling.

I was really impressed with the control of the blasting. They went right up to the scum line that remains on the boat. Any paint spots left are smooth.

Before:
IMG_5984 (1).JPG IMG_5985.JPG Photo Feb 17, 11 04 16 AM.jpg Photo Feb 17, 11 05 17 AM.jpg

After:
File Mar 30, 10 52 13 PM.jpeg File Mar 30, 10 52 24 PM.jpeg File Mar 30, 10 50 59 PM.jpeg File Mar 30, 10 51 32 PM.jpeg File Mar 30, 10 51 48 PM.jpeg

Now if it would just stop snowing here!
 

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b_arrington said:
Now if it would just stop snowing here!
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Looks great and yes this snow is really getting annoying.

Finally pulled my wrap off over the weekend only to be welcomed to more snow this morning (about 4 inched on my car). Good new is it should be melted by this afternoon. Winter is leaving kicking and screaming this year.

-Kevin
 
Maybe it's just my year, (1999) 380, but when I had the bottom stripped 2 years ago, we stopped counting the blisters at 60. And yes they were all properly repaired and epoxy bottom coated and then bottom paint. Here it is 2 years later and the bottom stills looks new.
 
I got to use the boat for the first time of the season yesterday. I wanted to give an update on the performance before / after stripping the bottom paint.

Before:
  • At spring commissioning, light load: Slow hole shot and time to plane. WOT ~30 mph, 4800 rpm, ~24 gph. Cruise: 26 mph, 3800 rpm, ~16-17 gph
  • Later in the season, with very modest growth (just a very little slime), speed was WAY down. Struggled to get on plane with a moderate load; VERY hard with full fuel. Light load: WOT ~29 mph, 4600 rpm. Cruise 24 mph, 4000 rpm.
  • Overall, big drop in performance from a few years ago.
After
  • At spring commissioning, med-light load (1/2 fuel, full water, usual "stuff" aboard):
  • Fast hole shot and time to plane.
  • WOT: 36.7 mph, 4950 rpm, 22.2 gph.
  • Cruise: 26 mph, 3600 rpm, 12.5 gph.
This was the fastest I've ever seen her go. The performance was so good it was like being on a completely different boat. I was running around the Long Island Sound outside Port Jefferson grinning like an idiot. All I could think of was, Yes! All that work stripping the bottom, fixing the gel coat, and epoxy barrier painting WORKED!
 
Sounds like a big improvement. Especially the drop from 16gph to 12.5gph along with the 200RPM drop at 26mph cruise. While it may take many hours for it pay itself back it will certainly make maintenance easier down the road.

-Kevin
 
I had a similar experience last spring after having my hull stripped, epoxy barrier coat, and slick bottom paint. It fells like a babies bottom! I wish i had taken the data, but the boat does feel smoother. There's a reason that racing sailors pay so much attention to the bottoms of their boats.
 
Doc O Rock said:
I had a similar experience last spring after having my hull stripped, epoxy barrier coat, and slick bottom paint. It fells like a babies bottom! I wish i had taken the data, but the boat does feel smoother. There's a reason that racing sailors pay so much attention to the bottoms of their boats.
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I can’t say it’s baby smooth. The blasting left a surface probably 60 or 80 grit. The epoxy coat smoothed it a little bit not a lot; it’s not smooth itself. The antifouling is ablative so it won’t polish up like some paints.

But it’s still so much smoother than before.
 
One other thing the OPr should consider is the condition of the hull after soda blasting. I had two earlier SRs blasted with soda and discovered a few voids in the gel coat resulting from the process. The yard repaired each with epoxy and sanded them smooth before installing a barrier coat and the final top coat. Voids commonly appear with blasting. We used VC bottom paint for both projects which is a great product for use in Lake Michigan. The outcome was outstanding, and the bottoms of both boats remained completely smooth with several paint recoatings in subsequent years. Can't say enough good things about VC. Wish my Tiara had this system.
 
Mine wasn't blasted as it had too many blisters. It was sanded, then the blisters repaired. (He stopped counting at 70), the sanded again, epoxy and then bottom paint. I'm on the second season and it's still SMOOTH! No touch up needed yet.
 
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