The Complete DIY Guide to Replacing Window Putty

Hey there! If you‘ve noticed cracks, crumbling, or gaps around your window panes, it likely means the putty seal has deteriorated. Not to worry – with the right materials and a bit of elbow grease, replacing that worn out window putty yourself can be a totally doable project.

In this comprehensive guide, I‘ll walk you through everything you need to know to remove old window putty and apply fresh new putty like a pro.

Do You Really Need to Remove the Old Putty?

When it comes to putting new putty over old, here‘s the scoop:

• If the existing putty is brittle, cracked, or falling apart in any way, it definitely needs full removal for the new putty to adhere properly.
• If the old putty still seems intact, you may be able to get by just smoothing it before adding new putty.
• However, removing the old putty completely is still recommended whenever possible for the strongest, most reliable seal.

Without full removal, there‘s a risk of the new putty not sticking well, shrinking back over time, or small gaps being left where air and moisture could penetrate.

So grab a putty knife and steel wool – we‘re taking it all the way down to the bare frame!

DIY Window Putty Removal in 6 Easy Steps

Arm yourself with these supplies:

• Putty knife
• Plastic scraper
• Mineral spirits
• Wire brush
• Sandpaper
• Painter‘s tape
• Rag

Then follow these steps:

1. Score the old putty. Use a utility knife to cut into the putty around the entire pane. This breaks the seal for easier removal.

2. Pry up the old putty. Slide your putty knife or plastic scraper under the cut putty and slowly work it off the frame. Take care not to gouge the wood.

3. Scrub off residue. Use a wire brush or sandpaper to remove any remaining flecks of old putty stuck to the frame.

4. Clean the frame. Wipe the entire surface with mineral spirits using a rag or paper towel to prep it for new putty.

5. Sand and smooth. Lightly sand any roughness or inconsistencies on the frame.

6. Tape off the pane. Apply painter‘s tape around the perimeter of the glass, leaving about 1⁄4 inch of space between the tape and pane.

And voila – that old, dried out putty is history! Now on to the fun part…

Preparing the Window Frame

Before applying fresh putty, it‘s crucial to make sure the window frame surface is properly cleaned, primed, and ready to form a solid bond.

Here are a few tips:

• Allow the frame to dry fully after cleaning off any solvents. New putty won‘t adhere well to a damp surface.

• Prime bare wood with an all-purpose primer if the old paint has been stripped away. This gives the putty something to "grab" onto.

• For metal frames, sand lightly with fine grit sandpaper before wiping clean with a dry cloth.

• Ensure the frame has no rough spots that could leave gaps under the new putty.

Taking this prep time will go a long way toward creating a durable, lasting putty seal.

Choosing the Right Putty + Tools

With so many putty types available, how do you pick the right one? Here are a few pointers:

• Oil-based putty is preferable for durability. It resists shrinking and cracking better than latex alternatives.

• Match putty color to your frame finish – white, off-white, or gray shades are common.

• Buy putty marketed specifically for windows rather than all-purpose glazing putty.

• Get High-quality putty from paint stores rather than cheap hardware store varieties.

• Plan on 1-2 tubes of putty per average sized window.

You‘ll also need a few key tools:

• Putty knife – Essential for pressing putty into the frame channel. Opt for a 2-3 inch blade.

• Glazing tool – Handy for smoothing putty neatly against the glass.

• Finger – You can use your index finger for smoothing small areas.

• Paper towels – For keeping hands clean while working the putty.

With quality putty and tools in hand, you‘re ready to reglaze like a pro!

Mastering the Putty Application Process

Here‘s a step-by-step guide to ensure perfectly smooth, highly durable putty:

1. Knead the putty first until pliable – this prevents cracking as it dries.

2. Press into place firmly using your putty knife, working all the way around the pane. Fill any gaps or crannies.

3. Smooth with light pressure, angling the knife to create a gentle dome shape away from glass.

4. Clean up excess putty with a paper towel and mineral spirits if needed.

5. Use glazing tool to create a continuous concave seal against the glass.

6. Give putty at least 3 days to dry before removing painter‘s tape or painting.

7. Seal with linseed oil for increased weather protection after putty has dried.

Take it slowly, and don‘t stress if your lines aren‘t picture-perfect right away. Putty-sealing windows takes practice, but you‘ll get the hang of it!

6 Quick Putty Troubleshooting Tips

Q: The putty won‘t adhere properly to the frame.

A: The surface may not be clean or dry enough. Wipe it thoroughly with mineral spirits and allow to dry completely before applying putty.

Q: Excess putty won‘t wipe off cleanly.

A: Let it dry partially – fresh putty will stay gummy. Return when dried slightly and it should scrape off more easily.

Q: There are gaps between the putty and glass.

A: Press a small amount of fresh putty into the gap using a glazing tool. Smooth carefully for an airtight seal.

Q: The putty is cracking already.

A: Drying too fast can cause cracking. Apply mineral oil while still pliable in the future to slow drying time.

Q: Paint won‘t fully adhere to putty areas.

A: The putty likely didn‘t fully cure. Allow extra dry time before painting puttied sections.

Q: My reglazed window still feels drafty.

A: Try sealing the gap between the window and frame with caulk for an extra layer of weatherproofing.

Hope these troubleshooting tips help you handle any putty pitfalls! Now let‘s talk maintenance.

Caring for Your Windows Post-Reglazing

Fresh putty and proper installation are only half the battle. Keep your windows in peak shape after reglazing with these maintenance tips:

• Inspect putty twice annually for any new cracks or gaps that could compromise the seal.

• Repaint the putty as needed to maintain a protective top coat – every 2-4 years typically.

• Re-caulk exterior joints to guard against moisture penetration.

• Dust and clean panes gently with vinegar water rather than harsh cleaners.

• Avoid scraping tools like razor blades to prevent glass damage when cleaning.

• Install storm windows in winter for added insulation and energy savings.

• Limit shade and window treatments that could trap heat and accelerate putty breakdown.

With consistent inspection and care, high-quality window putty should last 8-15 years in normal weather conditions before needing replacement again!

Still Drafty? Time to Consider Replacement

What if your windows are beyond just a fresh putty job? Here are some signs it may be time for total window replacement:

• Rotting wood frames that can‘t support new putty or glazing
• Moisture damage from chronic leaks and poor sealing
• Broken or severely fogged glass that reglazing can‘t address
• Metal frames badly corroded by rust

Replacement also makes sense if your goal is upgrading efficiency. Some key benefits of new windows:

• Double or triple pane glass for vastly improved insulation
• Advanced frame materials like fiberglass that prevent heat/cold transfer
• Energy efficient coatings that reduce UV damage and temperature transfer
• Enhanced noise reduction for traffic or other exterior sounds
• Added security features like shatter-proof glass.

Weighing Replacement vs. Reglazing Costs

	Reglazing	Full Replacement
Professional Labor	$300-500 per window	$800-1200 per window
DIY Labor	$50-150 per window	N/A
Material Cost	$15-30 per window	$120-300 per window
Energy Savings	10-15% avg	15-25%+
Noise Reduction	Minimal	Moderate-high
Disruption	Low	High
Maintaining Historic Architecture	High	Low

Replacement clearly offers greater efficiency gains. But for houses where preserving original character is important, reglazing can still be money well spent.

Get multiple pro estimates to determine the best value for your specific project scope.

Reglazing Mistakes to Avoid

While window putty replacement is well within reach for DIYers, it‘s still easy to mess up! Steer clear of these common mistakes:

• Not fully removing all old putty residue before applying new putty
• Failing to clean and properly prep the window frame first
• Using cheap, low-quality putty rather than good commercial grade putty
• Not applying putty generously enough to fill gaps, or smoothing unevenly
• Applying putty over damp surfaces rather than dry, clean frames
• Removing painter‘s tape or painting too soon before putty has fully cured
• Using razor blades or harsh scrubbers when cleaning reglazed windows

Patience and close attention to detail go a long way! Rushing through putty removal, prep, or installation is often where projects go awry.

Parting Thoughts

Worn out window putty failing to keep out drafts and moisture is a common issue in older homes. But with the right techniques, window reglazing can restore those leaky windows to prime condition.

Take your time removing old putty thoroughly – don‘t just put new over old! Clean and sand frames until immaculate. Invest in commercial-grade putty and apply generously for an airtight seal. And give the putty ample curing time for maximum durability and longevity.

With high quality materials and proper installation, fresh window putty should serve you well for over a decade before needing replacement again. But be vigilant with twice yearly inspections for any new cracks or failures. And take good care of those restored windows with regular caulking, painting, cleaning and storm window installation.

Hope this guide gives you confidence to tackle window putty replacement yourself. Just work slowly and carefully. I‘m confident you‘ll complete this project with windows that look and perform beautifully. Let me know if you have any other questions!