Your pool’s interior does more than make the water look inviting. It’s also an important part of protecting the structure underneath. Between changing temperatures, chemical exposure, and years of everyday use, pool surfaces endure a lot. Over time, these conditions can lead to cracking, staining, deterioration, and costly repairs.
While regular maintenance plays an important role in keeping a pool in good condition, the type of interior finish you choose can make a significant difference in how well it holds up.
That’s where INTER-GLASS® comes in. Developed and manufactured by Mid-America Pool Renovation, INTER-GLASS® is a proprietary reinforced pool interior system that bonds directly to the existing pool shell, creating a durable, watertight surface designed for long-term performance.
So, what makes INTER-GLASS® different from traditional pool finishes? Let’s look at three of the biggest challenges pool surfaces face and how the right interior can help.
1. Freeze-Thaw Cycles: When Temperature Changes Take Their Toll
If you own or manage an outdoor pool in the Midwest, you’re no stranger to unpredictable weather. Temperatures can climb well above freezing one afternoon and drop below freezing overnight.
While these fluctuations might seem harmless, repeated freezing and thawing can cause significant damage to pool surfaces.
Here’s what happens: When moisture finds its way behind pool tiles, into cracks, or through porous materials, it can freeze as temperatures drop. As water freezes, it expands, putting pressure on the surrounding materials. When temperatures rise, the ice thaws. Repeated cycles of expansion and contraction can gradually weaken the surface and cause damage.
Over time, this process can contribute to:
- Widening cracks as moisture freezes and expands within existing cracks.
- Delamination and Pop Offs as trapped moisture expands beneath the finish, weakening its bond and causing separation from the underlying surface.
Traditional cement-based pool finishes are more rigid, making them vulnerable to cracking when movement or underlying structural issues occur.
How INTER-GLASS® Helps
INTER-GLASS® was developed specifically to perform in demanding climates. Unlike traditional cement-based finishes, its reinforced polymeric system incorporates layers of resins and fabrics that create a flexible, watertight interior.
This flexibility allows the system to better accommodate movement while resisting cracking associated with freeze-thaw conditions.
INTER-GLASS® is also an option for pools with existing structural cracks. During renovation, cracks can be addressed using reinforcing fabrics selected according to the severity of the damage and incorporated into the INTER-GLASS® system.
This is an important distinction when comparing resurfacing options. While cracks can also be repaired beneath plaster or other cement-based finishes, those repairs are often not warrantied against the cracks returning. INTER-GLASS® crack repairs are included within the applicable warranty coverage.
For pool owners in climates where winter temperatures fluctuate regularly, choosing an interior designed to withstand these conditions can make a meaningful difference in long-term performance.
2. Stains & Algae: Why Your Pool’s Surface Matters
Even a well-maintained pool can develop stains or algae problems over time. And while water chemistry, filtration, and routine cleaning are essential, the characteristics of the pool’s interior surface can also influence how easily it stays clean.
Traditional plaster and other cement-based finishes have porous surfaces. As these materials age, their texture can become rougher, creating areas where stains and algae are more difficult to remove.
This can mean additional brushing, cleaning, and maintenance to keep the pool looking its best.
How INTER-GLASS® Helps
One of the defining characteristics of INTER-GLASS® is its smooth, nonporous surface.
Because the surface doesn’t absorb water in the same way porous cement-based materials can, it helps resist staining and makes it more difficult for algae to establish itself on the interior.
For pool owners and operators, that can translate to:
- Easier routine cleaning
- Greater resistance to staining
- Less scrubbing to maintain the pool’s appearance
- Less money on chemicals
Of course, no pool surface eliminates the need for proper maintenance. Balanced water chemistry, adequate circulation, and regular cleaning are still essential, regardless of the interior finish.
But choosing a surface designed to resist staining and algae can help make that ongoing maintenance more manageable and affordable.
For commercial facilities where pool appearance and maintenance are ongoing operational priorities, these benefits can be especially valuable.
3. Time & Wear: Choosing a Surface That Goes the Distance
Every pool interior has a lifespan. Years of chemical exposure, regular use, cleaning, and environmental conditions gradually take their toll.
When the existing interior starts to deteriorate, resurfacing becomes an important consideration. But choosing a new finish isn’t just about restoring the pool’s appearance. It’s also an opportunity to consider durability, maintenance requirements, and how well the new surface will perform for years to come.
It’s natural to focus on the initial renovation cost. After all, resurfacing a pool is a significant investment. But the upfront price is only one part of the equation.
The durability of the material, warranty coverage, maintenance requirements, and potential for future renovations should all factor into the decision.
How INTER-GLASS® Helps
INTER-GLASS® is designed with long-term performance in mind. Its reinforced construction creates a durable interior that resists cracking, staining, and everyday wear.
It’s also backed by our 25-year limited warranty covering both labor and materials.
For comparison, our traditional plaster and exposed aggregate finishes carry a seven-year warranty.
That difference in warranty coverage is worth considering when evaluating renovation options, particularly for facilities looking to minimize future disruptions.
A pool renovation doesn’t just involve the cost of materials and installation. Depending on the facility, it may also require closing the pool, adjusting programming, or scheduling work around seasonal operations.
Choosing a surface designed for long-term durability can help reduce the likelihood of repeated renovations and the inconvenience that comes with them.
Is INTER-GLASS® Worth the Additional Investment?
INTER-GLASS® typically requires a higher initial investment than traditional plaster. However, the lowest upfront price doesn’t always represent the best long-term value.
When comparing pool resurfacing options, consider the following:
| Factor | INTER-GLASS® | Traditional Plaster & Cement-Based Finishes |
| Surface Composition | Reinforced polymeric system | Cement-based material |
| Surface Characteristics | Smooth and nonporous | Porous |
| Crack Resistance | Flexible, reinforced system designed to resist cracking | More rigid finish that can be susceptible to cracking |
| MAPR Warranty | 25-year limited warranty | 7-year limited warranty |
| Crack Repairs | Reinforced repairs covered under applicable warranty terms | Repairs not warrantied against crack recurrence |
| Cure Time | Quick curing process | 28 days |
Neither option is necessarily the right choice for every pool. Budget, existing conditions, facility needs, and long-term plans all play a role in determining which finish makes the most sense.
For owners looking for a durable, low-maintenance interior with extensive warranty coverage, INTER-GLASS® may be worth the additional upfront investment.
The Product Matters. So Does the Team Behind It.
Mid-America Pool Renovation has been manufacturing INTER-GLASS® for more than 30 years and remains its only installer nationwide.
Because we both manufacture and install the system, our team understands the product from production through application. And with a 25-year limited warranty covering both labor and materials, we’re committed to standing behind our work long after the renovation is complete.
We’ve installed INTER-GLASS® in pools across the country, from residential backyards to commercial and community aquatic facilities, helping owners and operators address deteriorating interiors, recurring cracks, and the challenges that come with aging pool surfaces.
Interested in learning more? Explore the INTER-GLASS® system or [contact Mid-America Pool
