*Painting An Un-painted Galvanized Roof* - Painting - DIY Chatroom Home Improvement Forum


Go Back   DIY Chatroom Home Improvement Forum > Home Improvement > Painting

CLICK HERE AND JOIN OUR COMMUNITY TODAY...IT'S FREE!

Reply
 
Thread Tools Display Modes
Old 01-30-2009, 04:45 PM   #1
Newbie
 
Join Date: Jan 2009
Location: New Zealand
Posts: 5
Rewards Points: 10
Default

*Painting an un-painted galvanized roof*


Hi there,apologies if this topic has been discussed before as this is my first post, so here goes....

Im looking at painting my roof,it has never been painted before although it is fairly old.There are spots of rust here and there but not alot and by the looks of things,its only surface rust.Now Im wanting to know whats the correct procedure to prep the roof for painting.

So far these are the things we have bought: Blackguard(this is a rust converter product)
:30secs Outdoor Cleaner(this is a concentrate bleech-like product which contains 50g/L of Sodium Hypochlorite)
:British Paints Steelite roof paint (this is a self primer top coat paint which says on the bucket that I dont need to prime my roof,even if it hasnt been painted before??)......

Now,how would one go about preparing the roof for paint and would it be a good idea to buy an actual galvanized primer before applying top coat,even though the top coat is self priming? .....Ive read somewhere that the white substance you see on galvanized roofing will help adhere the paint to it so its not advisable to clean it off,so they suggested to spray rust converter on rust and then paint straight over it Huh .There is also some black silicon on the roof which was put up there to seal a leak,I hope this is paintable...

Advertisement


Last edited by Toymit; 01-30-2009 at 05:03 PM.
Toymit is offline   Reply With Quote
Old 01-30-2009, 05:42 PM   #2
Tired, Cold, and Damp
 
slickshift's Avatar
 
Join Date: Aug 2005
Location: Cape Cod
Posts: 3,089
Rewards Points: 2,000
Default

*Painting an un-painted galvanized roof*


If you've decided on a top coat product (sorry I'm not familiar with the ones you mention), the best course of action is to contact the manufacturer
I would call them (if they don't have a tech line, don't use the product) rather than rely on can or website instructions

Advertisement

slickshift is offline   Reply With Quote
Old 01-31-2009, 06:53 AM   #3
Doer of Many Things
 
poppameth's Avatar
 
Join Date: Oct 2008
Location: Staunton, VA
Posts: 1,179
Rewards Points: 526
Default

*Painting an un-painted galvanized roof*


Judging from the product selection, I'd say you are not in the US. I don't know exactly what is available to you if that's the case. However, I'll say that your prep sounds about right though I'd remove any loose particles on the roof. Any powder will cause the paint to fail. Galvanized surfaces are especially tricky. You need to remove any chemical residue from it. The zinc coating on a galvanized roof makes anything hard to stick to it. Since it's had time to weather quite a bit and you plan a good cleaning I don't think you'll have a problem with adhesion. The black silicone is a problem. Nothing really sticks too well to silicone. Are you sure it's a silicone sealant or is it perhaps asphalt? The product you selected for a top coat is thankfully acrylic. Acrylics will work best on galvanized. Oil doesn't like it too much. Acrylic should stick to a well weathered asphalt patch as well if that is what is sealing those leaks. Personally I'd use an acrylic DTM rust inhibitive primer before painting despite what the paint says.
poppameth is online now   Reply With Quote
Old 01-31-2009, 11:34 AM   #4
Newbie
 
Join Date: Jan 2009
Location: Stillwater, Minnesota
Posts: 11
Rewards Points: 10
Default

*Painting an un-painted galvanized roof*


There are primers available through mainstream retail outlets made specifically for galvanized surfaces. I would apply the primer before moving forward with a topcoat. Also, caulks made with 100% silicone can't be topcoated with paint. The paint will simply bead up and eventually slide off the silicone. There are other products on the market with silicon type qualities tat will accept a top coat however.
minchu is offline   Reply With Quote
Old 02-01-2009, 04:24 PM   #5
Newbie
 
Join Date: Jan 2009
Location: New Zealand
Posts: 5
Rewards Points: 10
Default

*Painting an un-painted galvanized roof*


Thanks for replies...(btw Im in New Zealand) I rang British paints and inquired about the paint I bought of theirs, the tech reckons I dont need to prime the roof maybe just the bits where Ive used the rust converter incase it reacts with the top-coat (they reckon 3 coats all together).They were not farmiliar with the rust converter I bought (even though its a popular product here in NZ) as I told them it is self-primer too. As for the black silicon sealant,Im not sure if it is silicon I just assumed it was,it was put on the roof before we moved in,mustve had a leak prior.
Toymit is offline   Reply With Quote
Reply

Tags
galvanized , paint , preparation , roof , rust


Thread Tools
Display Modes

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 Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Un-painted galvanized roof preparation Toymit Roofing/Siding 3 01-30-2009 05:07 PM
Smoothing out a painted and not painted drywall surface MarksHouse Drywall & Plaster 5 10-21-2008 12:50 PM
Sheetrock mudding over existing painted textured surface? SKINNY Remodeling 8 10-13-2008 01:00 PM
Old Galvanized shower/bath inlets Relpace Pex? sssalas Plumbing 2 09-08-2008 04:56 PM
Darn. A leak in my main supply from street, Galvanized. In foundation under slab? twilightcall Plumbing 2 07-31-2008 01:22 AM




Top of Page | View New Posts