Notices
Like Tree5Likes
  • 1 Post By Bullshipper
  • 2 Post By coores14
  • 1 Post By Raybo Marine NY
  • 1 Post By glassgrinder

What kind of sprayer for gelcoat?

Old 05-03-2019, 06:27 PM
  #1  
Senior Member
Thread Starter
 
Join Date: Sep 2017
Location: Garden City, Utah
Posts: 178
Default What kind of sprayer for gelcoat?

Can I use a normal cup gun to spray gelcoat or is it too thick?I see folks recommend a preval sprayer but I've got a 2x3 hatch to do so I think it won't have enough juice.
Twahl is offline  
Old 05-03-2019, 06:59 PM
  #2  
Senior Member
 
Join Date: Nov 2006
Location: Kent Island, MD
Posts: 2,034
Default

The cup gun will work, it's the tip size that's more important, and the thinning. Sprayed gel coat comes out flat if you don't use an additive. I had good luck with "Duratec High Gloss Additive".
mikie is offline  
Old 05-03-2019, 07:24 PM
  #3  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: Sep 2003
Location: CA & San Carlos, Mx
Posts: 20,737
Default

Gel coat really should not be thinned.Cup and gravity guns will have a hard time with it if it is not.

A air pressurized feed cup 3 mm tip primer gun is probably the cheapest alternative for small repair jobbs like your, but you will still probably have to finish with wet fine grit 320 and 600 prior to waxing.

If using a female mold with a finished suface and PVA, you can use a brush if you load the brush up with material prior to every stroke on mod to get a thick coat. Figure about using 1.2 kg of material per square meter. to get 20-30 mils dried thickness.
CANARIANFISHER likes this.
Bullshipper is offline  
Old 05-04-2019, 03:33 AM
  #4  
Junior Member
 
Join Date: May 2019
Posts: 17
Default

You need a special sprayer for this operation, ONLY made for gelcoat.
tgabriel is offline  
Old 05-04-2019, 04:32 AM
  #5  
Senior MemberCaptains Club Member
 
Join Date: Oct 2005
Location: Key West
Posts: 11,787
Default

tunnles knows. he'll tell us.
Cucumber and smccormick like this.
coores14 is offline  
Old 05-04-2019, 04:36 AM
  #6  
Admirals Club Admiral's Club Member
THT sponsor
 
Join Date: Jan 2006
Location: Lindenhurst, New York
Posts: 7,749
Default

problem with a dump style gun is it puts too much material too thick, not an issue in a mold or maybe a horizontal surface but even when you sand and polish it the surface is now distorted no matter how much you block sand it
there is a delicate balance between keeping the gelcoat pure and being able to spray it. combinations of gun type, ability, environment and temperature, size of the area you are spraying/amount of material you need to spray, and of course gelcoat type.
HarvestTime likes this.
Raybo Marine NY is online now  
Old 05-04-2019, 06:01 AM
  #7  
THT Sponsor Admiral's Club Member
THT sponsor
 
Join Date: Jan 2008
Location: Fire Island NY
Posts: 1,121
Default

I sprayed both hullsides on my Atlantic with gelcoat after Sansy. I used a spray gun form Harbor Freight, mixed the geloat with Duratec and thinned it a bit. Boat came out great. Did have to do the obligatory sanding to get the orange peel out but it came out quite good
rdiesel01 is offline  
Old 05-04-2019, 11:09 AM
  #8  
Senior Member
 
Join Date: Jan 2006
Location: shapleigh, maine
Posts: 109
Default

quote: (Raybo) " there is a delicate balance between keeping the gelcoat pure and being able to spray it. combinations of gun type, ability, environment and temperature, size of the area you are spraying/amount of material you need to spray, and of course gelcoat type."

So you're saying other than those few little considerations, it's pretty simple? LOLOL!!!
Raybo Marine NY likes this.
glassgrinder is offline  
Old 05-04-2019, 11:22 AM
  #9  
Admirals Club Admiral's Club Member
THT sponsor
 
Join Date: Jan 2006
Location: Lindenhurst, New York
Posts: 7,749
Default

Originally Posted by glassgrinder View Post
quote: (Raybo) " there is a delicate balance between keeping the gelcoat pure and being able to spray it. combinations of gun type, ability, environment and temperature, size of the area you are spraying/amount of material you need to spray, and of course gelcoat type."

So you're saying other than those few little considerations, it's pretty simple? LOLOL!!!
exactly! lol
Raybo Marine NY is online now  
Old 05-04-2019, 01:00 PM
  #10  
Senior Member
 
Join Date: Nov 2006
Location: Kent Island, MD
Posts: 2,034
Default

The Duratec High Gloss Additive worked extremely well for me. Finish came out like a high end yacht. If I remember correctly it was a 50/50 ratio of gel coat to Duratec, and then you catalyze for the total amount of gel coat and additive. You can apply multiple coats before dry with no problems and no sanding. Getting orange peel or other defects is not because of the product.
mikie is offline  
Old 05-04-2019, 01:32 PM
  #11  
Admirals Club Admiral's Club Member
THT sponsor
 
Join Date: Jan 2006
Location: Lindenhurst, New York
Posts: 7,749
Default

i found long term it yellows so I dont like using it and it will run on you like paint if you arent careful - the runs can sometimes look like color change after you sand them down
also works best spraying over an even colored surface not over body work/color change
Raybo Marine NY is online now  
Old 05-04-2019, 03:30 PM
  #12  
Senior Member
Thread Starter
 
Join Date: Sep 2017
Location: Garden City, Utah
Posts: 178
Default

Thank you for the replies. I didn't realize there was so much involved with it. I think I'll just mix up the gel with cabosil and fill in the blemishes instead of repsraying the whole hatch.
Twahl is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Thread Tools
Search this Thread