thru-hulls?

[minnow1193]

I need to replace/reseal the thru-hulls on my Balboa 20'. Originals are bronze or brass. Saw at the store that there are a couple types of composite/plastic fittings available. Is one better than the other? I know it depends on what is being attached to it. Also, will be painting the bottom at some point, better to install them prior to painting, or after to better seal them from the outside? Thanks in advance for any help.

[mitiempo]

Bronze not brass. Brass doesn't last long in salt water.

The composite ones are Marelon, much tougher than plastic.

Best to keep the materials alike - all bronze or all Marelon.

Here's are 2 links for installing thru-hulls.

Seacock & Thru-Hull Primer/Pre Information Photo Gallery by Compass Marine at pbase.com

Replacing Thru-Hulls and Seacocks Photo Gallery by Compass Marine at pbase.com

[MarkSF]

Originally Posted by minnow1193

I need to replace/reseal the thru-hulls on my Balboa 20'. Originals are bronze or brass. Saw at the store that there are a couple types of composite/plastic fittings available. Is one better than the other? I know it depends on what is being attached to it. Also, will be painting the bottom at some point, better to install them prior to painting, or after to better seal them from the outside? Thanks in advance for any help.

Groco bronze seacocks are the way to go. They aren't that expensive.

A good yard will paint the outside of the mushroom (including the bore) with anti-fouling paint. So yes, install them before painting, then paint the lot.

[minnow1193]

Thanks for the help. Paint will adhere to bronze ok?