Inter protect and micron csc coverage

[whoover]

I'm starting to think about doing the bottom of my 1973 42c. There are no blisters or other problems, its just time to get rid of the 49 years of layers and I would like to redo my boot stripe. The issue is trying to calculate the amount of material required for coverage. If anyone has done a boat in this size or close how much did it take.

Thanks
Walt Hoover

 

[brettportzer]

I’m going with 1 gallon per side, per coat as my estimate.

So, Interlux 2000E, I have 6 gals of grey, 4 gals of white.

3/8” nap roller application.

The actual answer will be known soon!

 

[dsharp]

2 gallons will be enough for 1 coat. You should have enough left over for two coats from the chine to the waterline. The interprotect, I think, recommends two coats. If so I think 3 gallons will be enough. How are you going to remove all of the old bottom paint?

 

[brettportzer]

Interprotect recommends 5 coats with roller application.

 

[whoover]

Thanks for the amounts. I was trying to use theoritical coverage from interlux and the materials required didnt make sense. Since Brett is doing his first and his hull is similar to mine I will be interested to see how he makes out. I plan on doing this next spring, I would like to find winter storage that will allow me to have it media blasted this fall. If not I'll be sanding. I have a dewalt vaviable speed disc sander with 5" discs. It has dust collection and goes to a cyclone dust collector. I have tested it and it works well, it will take more time but it will work. Brett are you going to alternate the colors of the inter protect to judge coverage?

Thanks
Walt Hoover

 

[brettportzer]

Yep, gray and white alternating, then one coat of red, two coats of blue.

No possible way could I have sanded my hull, there was so much paint on there.

Had it blasted and still and spending a ton of time getting the blue out of various nooks and crannies.

 

[whoover]

I agree, getting the paint out from around the shafts will be a time suck for sure.

Walt Hoover

 

[brettportzer]

It took the guy 5 days to blast it with a wet sandblast set up. "Dustless blasting".

It has taken me like 5 days so far just to get the little details that he couldn't get to.

 

[whoover]

Thanks for all the information. Five days of wet blasting, wondering how many days of sanding that will equal? This could be a very long fall!

Walt Hoover

 

[brettportzer]

so, I wanted to update this thread to say that basically, having finished the bottom job on my 43DC, I used this, for materials:

2 gals of West System 105/205

11 gals of Interlux Interprotect 2000E (6 gray, 5 white) (extra gallon of the gray was really only necessary because of some extensive fairing on the transom)

2 gals of Interlux Fiberglass Bottomkote NT in Red

5 gals of Interlux Fiberglass Bottomkote NT in Blue, but this was a mixture, 4 gals Blue 1 gal Black to make a darker color.

4 liters (the larger size, I think it is a liter) of Interlux Watertite Fairing compound

I have a little bit of the West System left over, and I used all of the Interprotect 2000E and I have 1/2 gal of red left over and I have 1 1/2 of my blue mixture left over.

But basically, 1 gal of each of those products does one side of the boat.

 

[brettportzer]

Here are some in progress pics:

 

[brettportzer]

Couple more.

 

[brettportzer]

Fairing.

 

[brettportzer]

Comparison, 10-15 yrs ago at Fairview Marina in Baltimore, to last week in Albany, NY.

 

[whoover]

Thanks for your materials list Brett. Now I know what in in for. Boat looks real nice.

Walt Hoover

 

[brettportzer]

Also of note, I guess the working theory was that the blasting would "open up" and blisters, and I was somewhat surprised that there weren't really any laminate blisters, even the the gelcoat was pretty beat up...

Turns out, the blasting that I had done, which was dustless blasting, which is like 100 psi with basically water and sand, did NOT "open up" any blisters...

My process was, blasted in late November, sat all winter, then I powerwashed it in March, which loosened more gelcoat chips...

Then I sanding off all of the remaining bits of antifouling paint and generally made sure everything was pretty clean.

Then I did 2 coats of unthickened West System with a roller, and then hot coated that with the first coat of Interprotect.

The plan was to fair that, and then continue, but it was much easier to fair if I sanded that first coat of Interprotect back down.

And during THAT process I discovered about 25 blisters, which I then ground out and filled with 3 or so layers or 1708 glass and then faired and continued on.

So, point is, poke around a bit for the blisters if you don't see any right away..!

But, the sanding should show them up, because they bulge a little bit.

 

[jim rosenthal]

Looks great, after all that work it should. A lot of hours in that.

 

[drburke]

Thanks very much for posting the pics; always informative!

DAN