Spray vs brush and roller for topcoat

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Shanff
Posts: 8
Joined: Sat Aug 22, 2015 8:14 am
Location: Dunedin, FL

Spray vs brush and roller for topcoat

Post by Shanff » Sat Apr 23, 2016 4:18 am

I'm rounding the last corner for the woodwork on my malahini and will be doing my topcoat over silvertip epoxy with system 3 WR-LPU glossy polyurethane. I did this already on the hull before flipping using rollers and brushes and am pleased. I'm considering getting a cheap sprayer from harbor freight since it's a large area including the deck, seats, floor, side walls, with a number of angles and vertical surfaces. I want to best avoid drips and thought it may leave a thinner layer with each coat. I also want to know if I can get the same high gloss finish with a sprayer.
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Stephen Hanff
Malahini Build
www.hanff.com/pages/boat.aspx
Dunedin, FL

Ozzieboat
Posts: 233
Joined: Sun Jun 07, 2009 4:40 am
Location: Logan, Queensland, Australia

Re: Spray vs brush and roller for topcoat

Post by Ozzieboat » Sat Apr 23, 2016 4:50 pm

Shanff
Although the last coat on my boat was applied by spray in a booth, it was done because of the difficulty I was having with dust. As far as quality of finish, when using a roller and tipped with a foam brush I did not notice any difference. I used International (Interlux) Perfection Plus clear. Just don't roller anymore than about 4-6 square feet before tipping.

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Roberta
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Joined: Tue Jul 31, 2007 5:23 pm
Location: East Troy, Wisconsin

Re: Spray vs brush and roller for topcoat

Post by Roberta » Sun Apr 24, 2016 5:51 am

You can get a good finish with rolling wr lpu. Make sure to use thin coats, keep a wet edge, and do it when the humidity is high. Wr lpu will run if applied too thick.
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

Brad Tucker
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Joined: Tue Jun 29, 2010 7:20 am
Location: Washington, GA

Re: Spray vs brush and roller for topcoat

Post by Brad Tucker » Tue Apr 26, 2016 9:38 am

I shot VC performance with an HF gun and was pleased with the results. I'm planning on doing the same thing using Perfection Plus 2 part poly. I'll let you know if it's a success or a disaster. I already know my brushing skills are terrible!

Brad Tucker
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Joined: Tue Jun 29, 2010 7:20 am
Location: Washington, GA

Re: Spray vs brush and roller for topcoat

Post by Brad Tucker » Mon May 02, 2016 5:09 pm

Ok.....be sure to thin it right or you'll be sanding a lot.

Brad Tucker
Posts: 336
Joined: Tue Jun 29, 2010 7:20 am
Location: Washington, GA

Re: Spray vs brush and roller for topcoat

Post by Brad Tucker » Sat May 07, 2016 1:24 pm

I just shot the last 2 of 5 coats with the HF gun. I do have some orange peel but it should sand out. Personally, I did have to thin out. 300ml base, 150 hardener, 100 2316 reducer is what I did. 10% was way too thick for me.

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Roberta
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Location: East Troy, Wisconsin

Re: Spray vs brush and roller for topcoat

Post by Roberta » Sat May 07, 2016 1:28 pm

With spraying HVLP it is important to have the correct size orifice and don't let the gun get too far away from the work. That will also create orange peel..

Roberta
Roberta "Queen of the Boat Builders"
Built Zip "Oliver IV", Super Spartan "Jimmy 70", and Torpedo "The Glen L".

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