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Re: TMS-20 update 6/17 [Re: ThunderMuffin] #234032
06/24/11 01:28 PM
06/24/11 01:28 PM
Joined: Jan 2009
Posts: 5,525
pgp Offline
Carpal Tunnel
pgp  Offline
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I don't find it all that tedious and I don't have to deal with overspray. Most of my sanding is wet sanding so I don't even have dust to deal with.


Pete Pollard
Blade 702

'When you have a lot of things to do, it's best to get your nap out of the way first.

-- Have You Seen This? --
Re: TMS-20 update 6/17 [Re: pgp] #234035
06/24/11 02:23 PM
06/24/11 02:23 PM
Joined: Feb 2009
Posts: 678
Palm Beach County
TheManShed Offline OP
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I find sanding with a cigar and drink close by an excellent form of relaxation. Now if I can just get rid of this cough.

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Mike Shappell
www.themanshed.com
TMS-20 Builder
G-Cat 5.7 - Current Boat
NACRA 5.2 - early 70's

Re: TMS-20 update 6/17 [Re: TheManShed] #234042
06/24/11 07:20 PM
06/24/11 07:20 PM
Joined: Jul 2007
Posts: 976
France
pepin Offline
old hand
pepin  Offline
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France
Originally Posted by TheManShed
I find sanding with a cigar and drink close by an excellent form of relaxation.[...]
You're my kind of guy: I'm reading the forum right now smoking a Cohiba Robustos and sipping on a 15yo Talisker smile

Re: TMS-20 update 6/17 [Re: pepin] #234082
06/27/11 08:59 AM
06/27/11 08:59 AM
Joined: Dec 2001
Posts: 5,590
Naples, FL
waterbug_wpb Offline
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can you apply Gelcoat with the HVLP sprayer given the correct tip and thinning?


Jay

Re: TMS-20 update 6/17 [Re: waterbug_wpb] #234089
06/27/11 10:31 AM
06/27/11 10:31 AM
Joined: Feb 2009
Posts: 678
Palm Beach County
TheManShed Offline OP
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I've only used an old cup sprayer Binks 7 - all metal.
I would suppose that a HVLP would work - that is a good question. With thinning, tip, and pressure adjustment it should work because the Gel coat is reduce to about same as paint for spraying.
Perhaps Jake or somebody else can help that has used a HVLP gun.

I keep on thinking about getting a new gun but I just rebuild my Binks each time. I have a “mini” HVLP for tight spaces and touch up but I not used it for anything but paint. A long time ago when I first started messing with cars a friend of mine who did show corvettes tutored me in shooting lacquer paint and a show car finish. But we all know that paint is only 20% of the job – prep is 80%. He helped me in the technique but always seemed to do better paint job it took me awhile to figure out why – it was all in the gun.
I was using a cheap gun at the time. For Gel Coat you can get away with a cheap gun. I have shot gel coat that came out pretty smooth with the Binks and it did not need to be sanded.

The last few boats I’ve used paint – auto paint on one for a custom job and Alwgrip on the other.

Gel Coat is cheaper the durability falls in between Auto paint and Alwgrip but the effort for Gel Coat is much more then both.

Pepin Cohiba Robustos - mmmmm from Havana?

Last edited by TheManShed; 06/27/11 10:39 AM.

Mike Shappell
www.themanshed.com
TMS-20 Builder
G-Cat 5.7 - Current Boat
NACRA 5.2 - early 70's

Re: TMS-20 update 6/17 [Re: TheManShed] #234102
06/27/11 12:54 PM
06/27/11 12:54 PM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
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you can use an HVLP gun for gelcoat. I do frequently. Just be sure your tip size is 2.3mm or larger. Northern Tool has a decent $30 gun with the larger tip (the green gun). There's no point in spending a ton of money on the gun...it's going to end up a little lumpy anyway.

I just bought a cup gun that has a 6mm tip (good lawd). I haven't had a chance to use it yet but am hoping to make a cradle mold with it in the next couple of weeks. The cup gun spits out unthinned gelcoat but is, in my opinion, probably not good for finish work (perhaps if you have a finer tip). It is great, however, for interior mold gelcoat prior to lamination and looks to be super easy to clean up.


Jake Kohl
Re: TMS-20 update 6/17 [Re: Jake] #234103
06/27/11 01:17 PM
06/27/11 01:17 PM
Joined: Jan 2009
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pgp Offline
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I guess it's just up to the guy doin' the work. Imo, paint is for cars, gelcoat is for boats.

In the end I don't suppose it really matters.


Pete Pollard
Blade 702

'When you have a lot of things to do, it's best to get your nap out of the way first.

Re: TMS-20 update 6/17 [Re: pgp] #234107
06/27/11 01:55 PM
06/27/11 01:55 PM
Joined: Feb 2009
Posts: 678
Palm Beach County
TheManShed Offline OP
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A shine is a shine be it a 5 cent or 10 cent job.

How it gets there is up to you - unless you got a good friend or payin' somebody!

As a general rule gelcoat is best for boats.


Mike Shappell
www.themanshed.com
TMS-20 Builder
G-Cat 5.7 - Current Boat
NACRA 5.2 - early 70's

Re: TMS-20 update 6/17 [Re: TheManShed] #234115
06/27/11 03:42 PM
06/27/11 03:42 PM
Joined: Dec 2001
Posts: 5,590
Naples, FL
waterbug_wpb Offline
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Originally Posted by TheManShed
As a general rule gelcoat is best for boats.


And, also as a general rule, I am bad for boats (or at least Trap lines, right pete?)


Jay

Re: TMS-20 update 6/17 [Re: waterbug_wpb] #234116
06/27/11 03:48 PM
06/27/11 03:48 PM
Joined: Feb 2007
Posts: 402
Punta Gorda, FL
J
jkkartz1 Offline
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Punta Gorda, FL
Pete,

How big of an area are you doing.

I got one of the little Preval sprayers. It will do about a square foot at a time. You can thin the gel coat in the glass spray bottle, then clean the sprayer and then spray with PVA.

Re: TMS-20 update 6/17 [Re: jkkartz1] #234119
06/27/11 04:05 PM
06/27/11 04:05 PM
Joined: Jan 2009
Posts: 5,525
pgp Offline
Carpal Tunnel
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The whole boat. There are five years worth of nicks, scrapes and dings. Time for a face lift.


Pete Pollard
Blade 702

'When you have a lot of things to do, it's best to get your nap out of the way first.

Re: TMS-20 update 6/17 [Re: jkkartz1] #234120
06/27/11 04:07 PM
06/27/11 04:07 PM
Joined: Nov 2005
Posts: 1,203
uk
TEAMVMG Offline
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uk
Gelcoat is best for HEAVY boats

Paint is best for LIGHT boats


Paul

teamvmg.weebly.com
Re: TMS-20 update 6/17 [Re: TEAMVMG] #234125
06/27/11 09:13 PM
06/27/11 09:13 PM
Joined: Jun 2002
Posts: 1,658
Florida Suncoast, Dunedin Caus...
catman Offline
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Florida Suncoast, Dunedin Caus...
Thinning of Gel coat, Someone said they used Lacquer thinner for gel coat. I never had, but I tried it. I have used mek solvent,styrene, Duratec, and Duratec thinner. I think the lacquer thinner worked the best. I have had no clogging of the sand paper when using lacquer thinner. Duratec is good but it adds a lot to the cost and I haven't seen the abilty of the gel coat to resist stain or loss of gloss improved by using it. Their thinner works great but is expensive. I haven't tried the the clearcoat they make but I will at some point.



Have Fun
Re: TMS-20 update 6/17 [Re: catman] #234144
06/28/11 09:18 AM
06/28/11 09:18 AM
Joined: Jan 2009
Posts: 5,525
pgp Offline
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Some of the dings will need filling. I was thinking of making my own bog by thickening gelcoat with cab o sil. The rationale: easy sanding, relatively water proof, the color will be easier to cover.

Thoughts?


Pete Pollard
Blade 702

'When you have a lot of things to do, it's best to get your nap out of the way first.

Re: TMS-20 update 6/17 [Re: pgp] #234146
06/28/11 09:49 AM
06/28/11 09:49 AM
Joined: Jun 2001
Posts: 12,310
South Carolina
Jake Offline
Carpal Tunnel
Jake  Offline
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Originally Posted by pgp
Some of the dings will need filling. I was thinking of making my own bog by thickening gelcoat with cab o sil. The rationale: easy sanding, relatively water proof, the color will be easier to cover.

Thoughts?


cabosil (fumed silica) does not sand easily! use microballoons (preferably phenolic but glass microballoons will work).

Or...easier...use premium bondo (black/gold can with blue hardener...I think the can says "professional" or "premium"). I use bondo with good results under gelcoat. It has a polyester resin base.


Jake Kohl
Re: TMS-20 update 6/17 [Re: Jake] #234147
06/28/11 09:58 AM
06/28/11 09:58 AM
Joined: Jan 2009
Posts: 5,525
pgp Offline
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pgp  Offline
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Thanks Jake. I'll try the ballons.

I want to get away from any contrasting substrate colors. Additionally, I use such small amounts another can of anything will just clutter up my work bench while it's going bad.

Last edited by pgp; 06/28/11 09:59 AM.

Pete Pollard
Blade 702

'When you have a lot of things to do, it's best to get your nap out of the way first.

Re: TMS-20 update 6/17 [Re: pgp] #234148
06/28/11 09:58 AM
06/28/11 09:58 AM
Joined: Jun 2002
Posts: 1,658
Florida Suncoast, Dunedin Caus...
catman Offline
Pooh-Bah
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Florida Suncoast, Dunedin Caus...
That's one of the best reasons for gelcoat. It's easy to fix. there's also stuff called Q-cells that sands very easy.


Have Fun
Re: TMS-20 update 6/17 [Re: catman] #234149
06/28/11 10:04 AM
06/28/11 10:04 AM
Joined: Jan 2009
Posts: 5,525
pgp Offline
Carpal Tunnel
pgp  Offline
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Thanks.


Pete Pollard
Blade 702

'When you have a lot of things to do, it's best to get your nap out of the way first.

Re: TMS-20 update 6/17 [Re: pgp] #234158
06/28/11 11:49 AM
06/28/11 11:49 AM
Joined: Dec 2001
Posts: 5,590
Naples, FL
waterbug_wpb Offline
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Naples, FL
the different colors can actually work to your advantage in they help you see how the fairing is going. I would suggest a light color rather than a vivid one so it won't show through on the final product.

Maybe a light grey under a white topcoat?


Jay

Re: TMS-20 update 6/17 [Re: waterbug_wpb] #234165
06/28/11 12:41 PM
06/28/11 12:41 PM
Joined: Jan 2009
Posts: 5,525
pgp Offline
Carpal Tunnel
pgp  Offline
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It's very hard to hide darker colors under a white top coat. At a distance they will show up as shadows.

It's simpler to tint the substrate the same shade as the top coat. Fairing is accomplished by dusting a light coat of black lacquer on the substrate and working until it is gone. It's like looking at a topographical map.


Pete Pollard
Blade 702

'When you have a lot of things to do, it's best to get your nap out of the way first.

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