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Spraying gel with a Preval sprayer

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Spraying gel with a Preval sprayer

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Old 08-20-2018, 09:41 AM
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Default Spraying gel with a Preval sprayer

Got a couple of areas where the vhf antenna mounts were that I removed and trying to spray gel to finish the task using the Preval sprayer as boat is in a slip.
Have thinned the gel with styrene at 15% and catalyst on the slow side for more work time. I can not get the gel to spray. 1st attempt it spit the gel out for a rough textured finish with styrene at 10%. Next attempt I went to 15% thinking too thick. Then it wouldn’t spray at all. Very small areas so the sprayer isn’t getting cold and gel still liquid state.
Whats the secret? Thanks
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Old 08-20-2018, 01:09 PM
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Is that the little Preval sprayer that has a clear jar that you load and it screws into a small aerosol canister ?
If it is I've never even been able to get them to atomize pure thinners or cleaning solvents with a viscosity of 0
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Old 08-20-2018, 02:10 PM
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Yes
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Old 08-20-2018, 02:54 PM
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I had excellent results with that sprayer and thinning with MEK. I can't recall the website I got the instructions from, but it seems they sold fiberglass repair products...perhaps out of Michigan. I cannot even see where mine was repaired - no "halo" effect at all. One tip that I learned is letting the spray cure for as long as practical before sanding / buffing. I let mine sit a couple of weeks before finishing, which is probably on the long end.
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Old 08-20-2018, 05:26 PM
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Maybe the ones I've used were sitting on the shelf for a long time and had lost pressure .
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Old 08-20-2018, 07:43 PM
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Ive tried/used 4 different ones, all new, with no luck. Have removed the small pickup tube strainer and still nothing.
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Old 08-20-2018, 08:42 PM
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go to michiganfiberglass.com , then go to the tips section. There as you scroll down, you will find some good information on spraying gel with the preval sprayer. Like I said earlier, I could not be happier with the results.
Nice Pair likes this.
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Old 08-22-2018, 07:36 PM
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thin it more and poke big holes in the strainer......
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Old 08-31-2018, 11:52 PM
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Remove that strainer from the bottom of the pick up tube.
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Old 09-15-2018, 08:34 AM
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We use them every day. You have to thin the gelcoat so its like paint. 15% is not nearly enough. We use acetone and don't forget the wax. Also when you tape the area use 2 inch tape and roll it back. You don't want a hard line to sand out. Good luck
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