Catalina "smooth" gel coat has a pebble grain texture. Is this normal? - Page 2 - SailNet Community
C25 and 250 For Catalina 25 and 250 owners

 3Likes
Reply
 
LinkBack Thread Tools
post #11 of 14 Old 4 Weeks Ago
Senior Member
 
TakeFive's Avatar
 
Join Date: Oct 2009
Location: Swarthmore, PA
Posts: 4,965
Thanks: 24
Thanked 143 Times in 132 Posts
Rep Power: 10
 
Re: Catalina "smooth" gel coat has a pebble grain texture. Is this normal?

I know I'm coming in late on this, but is it possible that you're seeing osmotic blistering? I have a small sailing dinghy that was stored under a cover for a year, and unfortunately moisture found its way between the cover and the deck. I ended up with small osmotic blisters over part of the deck, which looks sort of like pebble grain. I have left it as-is, because the only solution is to pop them open by hard sanding, dry them out, and redo the gelcoat. That is far more than the boat is worth. What you described sounds similar. Perhaps leaves fell onto your deck and trapped moisture against the gelcoat.

Rick S., Swarthmore, PA
USCG Certified Captain, OUPV and 50 Ton Master
ASA Certified 101/103/104/105/106



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

2001 Catalina 34MkII Tall Rig Wing Keel Breakin' Away, Universal Diesel M35B, Mantus 35 lb. anchor, sailing out of Rock Hall Landing Marina
TakeFive is offline  
Sponsored Links
Advertisement
 
post #12 of 14 Old 4 Weeks Ago
Above 5 knots
 
Join Date: Jun 2007
Location: East Stroudsburg, PA
Posts: 2,822
Thanks: 11
Thanked 180 Times in 173 Posts
Rep Power: 13
 
Dock
Re: Catalina "smooth" gel coat has a pebble grain texture. Is this normal?

Some notes.
Soft Scrub with bleach is actually, um, soft. It does have mild abrasive, but it wouldn't put a dent in gelcoat.

To damage gelcoat as you you describe would require something of a larger sort, as I've used 80 grit sandpaper to no avail at damaging gelcoat (attempting to smooth).

2 common catalina boats and sorry for my prior sarcasm I was having a bad day... of that vintage (which is honestly quite new if it really is a 1986)... and size...

Catalina 25:

Catalina 22:


Catalina had pretty decent gelcoat process down in their boats by the 1970s, and 1980s they were pros. If you are truly looking at gelcoat (I think you are looking at awlgrip or similar 2 part that has aged), then you can use a wetsand, compound, polish wax method to shine it up... or you can take the REAL lazy approach like I have a couple of times and just polyglow it and go sailing. There will be purists here who say NO NOT POLY GLOW, and I am here to tell you, life is to short to waste sailing time on compound polish wax and repeat, cause every 6 months you'll need to rewax.

MINI MOO, a 1983 Wavelength 24 - she's a fast cow!
SailingUphill is online now  
post #13 of 14 Old 4 Weeks Ago
Senior Member
 
Join Date: Feb 2010
Location: Narragansett Bay
Posts: 19,952
Thanks: 82
Thanked 565 Times in 542 Posts
Rep Power: 11
   
Re: Catalina "smooth" gel coat has a pebble grain texture. Is this normal?

Quote:
Originally Posted by SailingUphill View Post
Some notes.
Soft Scrub with bleach is actually, um, soft. It does have mild abrasive, but it wouldn't put a dent in gelcoat.
Bleach is highly alkaline and will damage gelcoat. As I said, probably not so much, if used once. Probably less noticeable, if the gel cost is already damaged. The issue is not that itís mechanically abrasive.

Quote:
.......I've used 80 grit sandpaper to no avail at damaging gelcoat (attempting to smooth).
Howís your eyesight?

There is no way that course sandpaper would not leave actual scratch marks. Even wet sanding with superfine paper needs swirl marks buffed out. Maybe the gelcoat you sanded was just that bad to begin with and it simply didnít get worse.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Jeanneau 54DS

In the harsh marine environment, something is always in need of repair. Margaritas fix everything.
Minnewaska is offline  
 
post #14 of 14 Old 4 Weeks Ago
Above 5 knots
 
Join Date: Jun 2007
Location: East Stroudsburg, PA
Posts: 2,822
Thanks: 11
Thanked 180 Times in 173 Posts
Rep Power: 13
 
Dock
Re: Catalina "smooth" gel coat has a pebble grain texture. Is this normal?

Minni I get your point yes it DOES scratch the gelcoat, but not easily. Gelcoat is not like paint. If there is any thickness to it (the gelcoat) then you can do an awful lot of rubbing to it before it creates a cracking. Impacts maybe, that'd do it. Softscrub with bleach will dry the surface and open the gelcoat to oxidation (more oxidation) which is the reason why you must reseal it to prevent that.

The 80 grit I used, was to level applied gelcoat, then was followed by successively higher grain until eventually compound, polish, and wax to bring it up to a shine. What I call a 10 foot shine, cause after all it was a $7500 boat, that was 40 years old, that had more repairs than the average 70s Ford Pinto.
Minnewaska likes this.

MINI MOO, a 1983 Wavelength 24 - she's a fast cow!
SailingUphill is online now  
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome