Gel coat spray gun recommedations? - SailNet Community
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post #1 of 9 Old 10-04-2016 Thread Starter
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Gel coat spray gun recommedations?

I need a decent gun for a single project, spraying my transom. There are a blinding array of them out there, many at very affordable prices. Can anyone recommend a specific model they have used, good enough to do maybe 25 square feet at the very most, cheap enough to give away/throw away afterwards?
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Re: Gel coat spray gun recommedations?

IMO, for gelcoat, get the cheapest siphon feed gun you can. Harbor Freight is good enough. The reason is that unlike paint gelcoat does not spray on as a finished surface. You will need to apply more gelcoat than you need and do a lot of wet sanding after application - 400/600/1000/1500/2000 grit sequence until polished and shiny. This will remove two of the coats you apply. So the goal is to just get the gelcoat on and any cheap gun will be fine - shouldn't need to pay more than $15-20.

Then just toss the gun after.

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Re: Gel coat spray gun recommedations?

http://www.tooldiscounter.com/ItemDi...ookup=TTN19023
Titan Hplv. 19023 $28
Make sure it has 2.2 mm or larger nozzle when spraying gelcoat
Have done several gelcoat projects with this gun and works perfect
Expensive gun won't do any better
Use duratec gel coat additive from Fiberglast.com spray two coats sand to 600 grit and polish with Presta gelcoat cutting compound

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Re: Gel coat spray gun recommedations?

My current 'primary' gel spray gun is an ESMfg. G860 HVLP w/2,5mm orfice nozzle. Like most 'quality' Gel/Resin spray guns, this one has a polyester top loading gravity feed cup; so, that WHEN any gel prematurely kicks inside the spray gun it won't be difficult to clean it. This spray gun is built with acetone resistant seals .... not so with many 'bargain' spray guns that can only be cleaned with acetone - a few times.
A smaller and less expensive version - https://www.amazon.com/G830-Gelcoat-.../dp/B007VFY8ZA I don't like any nozzle orfice dia. smaller than 2,5mm for gel.

For totally disposable gel spraying: http://www.jamestowndistributors.com...+Spray+Gun+Kit ..... but for spraying gel with 'disposables', filter the gel before adding catalyst and remove the integral 'filter' on the prevail. Separate propellent canisters and separate 'bottles' (16 oz.) are also available.

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Re: Gel coat spray gun recommedations?

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Originally Posted by overbored View Post
Titan 19023 Paint Spray Gun - Body Shop Tools
Titan Hplv. 19023 $28
Make sure it has 2.2 mm or larger nozzle when spraying gelcoat
Have done several gelcoat projects with this gun and works perfect
Expensive gun won't do any better
Use duratec gel coat additive from Fiberglast.com spray two coats sand to 600 grit and polish with Presta gelcoat cutting compound
$28 bucks sounds good to me! And I can buy that gun locally, for just a few bucks more.

The Duratec additive sounds good too, and people seem to like it. I guess it eliminates the need for waxed gel coat in addition to other things! How does it affect viscosity?

Thanks so much, guys! This is a "great news" thread, and I appreciate the informed responses. (Of course, now I'll probably wind up gel coating the entire hull before it's over.) LOL

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Re: Gel coat spray gun recommedations?

The Duratec is good stuff. it thins the gelcoat just right for spraying so you don't need to buy expensive thinners. you can spray two coats or more without sanding between coats like when wax is used. it does make the gelcoat a bit more transparent. it is mixed 1 to 1 so you get twice as much product. so you get more on the surface so not as easy to sand through. the Duratec surfacing primer is a very good product also. it is used to coat epoxy or polyester and sands very easy with no plugging of the paper. sand the surface to 80 grit so it has some tooth and and both products make the gelcoat stick forever . if using the primer use white or light gray for light colors. do not use the dark gray unless you are spraying dark colors. we only sand to 600 and use the Presta cutting compound. some will tell you to sand much finer but thats because they have never used The Presta gelcoat cutting compound product, a little more expensive save a lot of time.
pictures are of one of my latest projects , a "V" Boom add on wings to the original aluminum boom. Vacuum bagged Epoxy/ Carbon fiber Duratec primed and Gelcoat. no need for mirror to read the instruments.
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Re: Gel coat spray gun recommedations?

Just to reinforce this point: don't add wax until the last coat. All underlying coats should be wax-free.

overbored: that's a nice piece of work. How does it attach to the boom? What are those notches for? Does it interfere with reefing?

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Re: Gel coat spray gun recommedations?

or instead of wax, some PVA sprayed on the gelcoat could seal it up for the cure.

A Preval Sprayer can work well enough to spray PVA. Then once cured, just wash off with water which would be done during wet sanding anyway.

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Re: Gel coat spray gun recommedations?

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Originally Posted by colemj View Post
Just to reinforce this point: don't add wax until the last coat. All underlying coats should be wax-free.

overbored: that's a nice piece of work. How does it attach to the boom? What are those notches for? Does it interfere with reefing?

Mark
The V boom is attached to the boom with T nuts in the T track on the top of the boom the bolts also hold on the pad eyes for reefing and the outhaul track. The notches in the sides are there to give a bit more clearance for the shrouds.

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