Spraying Marine Urethanes

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Tail_Gunner

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Re: Spraying Marine Urethanes

For sanding down your primer, no. Get your self a sponge type of sanding block and cut down the primer with all the luv and paitience you have, that will be the whole paint job, that is if you can get the primer as flat and smooth as a mirror you will be very happy with your final out come.
 

Boomyal

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drewpster

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Re: Spraying Marine Urethanes

When I heard how hard the primer was it kinda freaked me out. If you think the air sander would be too aggressive it must not be as difficult as I assumed. The area I am planning to do with perfection makes up the largest area to be prepped and painted yet. I have the scuffs and damaged gelcoat filled. I also noticed Interlux surface prep being used to initially clean prior to 202 solvent wash. Are you using this?
 

Tail_Gunner

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Re: Spraying Marine Urethanes

OK that ordeal is over, i experienced difficultie's getting this cheap HPLV sprayer to shoot this PrimeKote, two error's were made in doing this, one trying to reduce the base paint down to a point that the gun would shoot it, that led to orange peel, and two when it did shoot it out it, the gun still wasn't enough to atomize the paint leaving it spitting or heavy droplet's,

This left a very rough finish (no sag's) the coating is very dense (which is good very high build) and is is quite hard. Now i am a lazy old bugger and do not like to sand so.......i just blamed it on the Paint (if you can call it that) I took about six hours to get it down a smooth finish that was smooth as glass (corsses finger's)

The second go around was the same but i did try a different method, this time i used the brushing solvent hoping it would flow a bit better and it did, just barely. The finish is not so peeled but still a bit bumpy and will require hour's to smooth it out, but i am done. The perfection will not have this issue as it is not a building primer............if so i am going to have a big burbon and come up with a different plan.......

Anyway's if you can get your hands on a good airless sprayer i will save you a few hour's of sanding, Oh as to wiping down between coat's i just use acetone cheaper and just as good, at least for me....

As to a sander id just get a good electric orbital for large flat surface's, tough spot's a sponge and by hand as alway's..
 
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Boomyal

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Re: Spraying Marine Urethanes

...if so i am going to have a big burbon and come up with a different plan.........

Will that be neat or with coke?:cool:

I think your 'adjustable tip' is causing you problems, either that or you don't have enough CFM. Do you have your compressor regulator turned all the way up, then dial down the pressure at the gun?
 

Tail_Gunner

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Re: Spraying Marine Urethanes

It's really not a paint in my book, more like a liquid bond-o..........Now A coke @ a moment like that.......Nope i want a real sledge hammer hittn me..:}
 

GreatKetch33

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Hello All,

I have read this post several times to learn, and I wish to add to the thread. The thread is old but very relevant.

I recently sprayed Brightside to a half wish-bone boom on my sailboat. Below are a few points regarding the success of my first paint job:

1) Sanded fiberglass spar
2) Used 202 to wipe down
3) Sprayed 3 coats of PreKote - wipe down 202 and sand between coats
4) Sanded between coats with 120
5) Sanded last coat of PreKote with 220 sand paper
6) Sprayed BrightSide - 2 parts Brightside, 1 part flattener, and 10 percent 216 thinner

a) compressor was 165psi to 90psi to 20psi on gun
b) 1.8 tip gravity fed gun
c) water separator, oil separator, desiccant, and small dryer on gun

What I learned:
The spraying of Prekote and Brightside was the easiest part of the job.
I need to improve on the body work skills. -- Although the spar is so much better than the condition it was prior to the work, I can see with much meticulous inspection a few areas that could have been made better.

I have another spar to work, and my hope is to have the body work looking better than the first attempt.

Thank you all who have contributed to this forum; helping others learn. My entry also provide help.
 
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