Do you sand the hull before fairing with QuickFair?

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Capt UB
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Do you sand the hull before fairing with QuickFair?

Post by Capt UB » Mon Oct 30, 2017 9:01 am

Hull is ready for fairing, that is it's covered with glass...

Wait for epoxy to cure?

Sanding before fairing? If so, 80 or lower/higher grid? I could not find anything that said to sand before fairing or not to!

How long to wait to start Fairing hull with QuickFair?

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2017 Bateau FS14, starting build Oct 2017.
2017 Bateau NC16, starting soon.

Jaysen
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Re: Do you sand the hull before fairing with QuickFair?

Post by Jaysen » Mon Oct 30, 2017 9:06 am

Sand to knock down threads. Do NOT try to make it "smooth". I'd go no higher than 80. If you're in the same epoxy family (west/s3/marin) fair once you've got the threads down and the hull clean. That gets you a better bond. If different families, cure then fair. If you do that, the sanding becomes much more important.

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Re: Do you sand the hull before fairing with QuickFair?

Post by Dougster » Mon Oct 30, 2017 10:47 am

Like Jaysen says, you sand to "knock down the threads". That's hard to explain, but there are pics around the forum here of what you're going for. You start to see a cross hatch pattern of the actual fiberglass strands once the thread that holds them together is reduced. You really don't want to sand too deep. Too little is no problem, just more fairing with the threads not sanded down. I always used 80 grit and and a RO sander, moving pretty fast. Once I see a bit of the cross hatch I quit.

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Re: Do you sand the hull before fairing with QuickFair?

Post by Capt UB » Mon Oct 30, 2017 12:03 pm

I'm using System 3 Silver epoxy with slow harder and fairing with QuickFair.

So, go ahead and sand to knock down threads, then fair.... No need to wait for full cure on epoxy.

I guess I'm Sanding tonight and Fairing after work tomorrow... Ya baby..get'en it done!

Thanks guys,

Bob.
I'm always lost when building a boat, it's when the boat is in the water, I know my way.

1970? 13' Canvas on frame canoe
2017 Bateau FS14, starting build Oct 2017.
2017 Bateau NC16, starting soon.

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Re: Do you sand the hull before fairing with QuickFair?

Post by Fuzz » Mon Oct 30, 2017 5:56 pm

The Quickfair and System3 go together so no need to wait. In fact you may get a better bond by not waiting.
Like the others have said knock down the threads and let the fairing fun begin :lol:

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Re: Do you sand the hull before fairing with QuickFair?

Post by Capt UB » Mon Oct 30, 2017 9:01 pm

Thanks Fuzz.

The weather here in Central Florida is great for sanding!!
I'm always lost when building a boat, it's when the boat is in the water, I know my way.

1970? 13' Canvas on frame canoe
2017 Bateau FS14, starting build Oct 2017.
2017 Bateau NC16, starting soon.

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Re: Do you sand the hull before fairing with QuickFair?

Post by Capt UB » Mon Oct 30, 2017 9:04 pm

Jaysen and Dougster, just looked over the hull. 80 just does the job. Thanks again. Bob.
I'm always lost when building a boat, it's when the boat is in the water, I know my way.

1970? 13' Canvas on frame canoe
2017 Bateau FS14, starting build Oct 2017.
2017 Bateau NC16, starting soon.

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Re: Do you sand the hull before fairing with QuickFair?

Post by TomW1 » Tue Oct 31, 2017 12:24 am

I just noticed that you have very sharp edges on the bottom to side where they meet. Before you put the fiberglass down you will want to round them to 3/8" so the fiberglass will smooth over the edges. You then square the edges and leave a 1/8" edge so the paint will hold to the edge. I know it is a lot of work but it will provide a better boat finish.

Tom
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Re: Do you sand the hull before fairing with QuickFair?

Post by Capt UB » Tue Oct 31, 2017 6:12 am

TomW1 wrote:
Tue Oct 31, 2017 12:24 am
I just noticed that you have very sharp edges on the bottom to side where they meet. Before you put the fiberglass down you will want to round them to 3/8" so the fiberglass will smooth over the edges. You then square the edges and leave a 1/8" edge so the paint will hold to the edge. I know it is a lot of work but it will provide a better boat finish.

Tom
Tom the radius is 1/2" R. Tape done and cloth down. Sanding and fairing now (then using high build primer). Hpoe to put down graphite epoxy next week. Following weekend paint the sides of the hull.

Thanks, Bob.
I'm always lost when building a boat, it's when the boat is in the water, I know my way.

1970? 13' Canvas on frame canoe
2017 Bateau FS14, starting build Oct 2017.
2017 Bateau NC16, starting soon.

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