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Manufacturer and Supplier of Pavement Maintenance Products and Equipment |
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SEALCOATER UNIVERSITY |
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You asked for it, and we deliver. |
| The "SEALCOATER UNIVERSITY" |
By popular demand, we have designated this portion of our catalog for educational purposes. Even experienced sealcoaters appreciate having a guideline handy for tricky jobs or calculations. We are dedicated to working with you to find ways to make your business more profitable. |
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Figuring Sealcoating Coverage Rates |
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Quantities of the material will vary according to porosity and texture of the pavement. The guideline quantities are expressed as the amount of undiluted sealer.
Most specifications will give coverage rates in gallons per square yard. |
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Two Coat coverage is 0.16 0.20 gal/sq.yd |
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1st coat 0.100.12 gal/sq.yd. |
2nd coat 0.060.08 gal/sq.yd. |
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Example -You measure 32566 square feet in a parking lot |
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Convert 32566 s.f. to square yards by dividing the square footage by 9. |
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32566 / 9 = 3618 square yards |
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Multiply the yardage (3618) by the coverage rate of the 1st coat (0.10). |
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3618 x 0.1 = 362 gallons undiluted sealer |
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Multiply the yardage by the coverage rate of the 2nd coat (0.08) |
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3618 x 0.08 = 289 gallons of undiluted sealer. |
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Add the 1st coat gallons and the 2nd coat gallons |
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362 + 289 = 651 gallons that you must buy |
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Figure water by multiplying the gallons sealer times the dilution %. |
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651 x 0.3 (30%) = 195 gallons water |
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Figure sand by multiplying the gallons sealer times the sand/gallon specified. |
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651 x 2 (2lbs/gallons) = 1300 lbs or 13 bags sand. |
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Total Mix |
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Sealer 651 > |
Water 195 > |
Sand 65 -1 bag sand is approx. 5 gallons in volume, 13 x 5 = 65 |
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911 mixed gallons needed to cover 32566 square feet in 2 coats using a 0.18 combined coverage rate. |
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Figuring Color Material Usage |
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Number of Courts in Battery |
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1 Court |
2 Courts |
3 Courts |
4 Courts |
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Number of Square Yards |
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800 s.y. |
1440 s.y. |
2080 s.y. |
2720 s.y. |
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Resurfacer |
# of Gallons
Concentrate |
# of Gallons
Concentrate |
# of Gallons
Concentrate |
# of Gallons
Concentrate |
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1st Coat |
55 |
100 |
145 |
190 |
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2nd Coat |
50 |
90 |
130 |
170 |
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Color |
# of Gallons
Concentrate |
# of Gallons
Concentrate |
# of Gallons
Concentrate |
# of Gallons
Concentrate |
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1st Coat |
40 |
72 |
104 |
136 |
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2nd Coat |
50 |
90 |
130 |
170 |
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3rd Coat |
24 |
43 |
62 |
82 |
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| 1. |
Rates are based on Laykold Mix Design |
| 2. |
Use approximately 1 gallon of white line paint per court for striping. |
| 3. |
For Two Tone Courts: Play Area is 324 s.y. per court. The out of bounds area will be the difference between the overall area and the total playing area. |
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All Coverage rates are averages. Surface porosity can increase or decrease quantities required, especially resurfacer. |
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Resurfacer |
Texture Coat |
Finish Coat |
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Dilute 50% water |
Dilute 80% water |
Dilute 90% water |
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10 Lbs. sand per gal. |
8 Lbs. sand per gal. |
No sand |
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(60100 mesh sand) |
(80100 mesh sand) |
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What causes cracks? In most cases cracks are formed when the pavement ages, oxidizes, or shrinks.
When should I seal the cracks? The cracks should be sealed as soon as they are 1/8" or wider. The cracks will double in width each year which speeds deterioration of
the pavement if not repaired. |
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Crack Sealing Procedures |
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Use the proper sealant. |
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Direct Fire Kettles - |
Requires a direct fire sealant like DuraFill HS. |
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DoubleJacketed Melters - |
Use the sealant required by the specification, normally a D3405 specification. |
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Elastobond 3405 - |
Meets or exceeds most specifications for parking lots, airports, and streets. Follow all heating guidelines when applying sealant.
Sealant that is overheated will remain tacky long after it cools and will be problematic for the customer resulting in sealant removal. |
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Rout the crack if possible -
Without a reservoir in which to place the sealant, the effective life
of the sealant will be reduced. Routed cracks may last up to 10 times
longer than nonrouted cracks. |
| Clean the Crack - The crack must
be cleaned of all debris using mechanical tools and by blowing with
compressed air. Hot compressed air is even better as it dries any moisture
in the crack.
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| Sealant Placement - It is important to fill the crack flush or even slightly under fill.
Use a pour pot followed by a
squeegee or a bander to apply the sealant. The resulting width of the crack sealant should not exceed 3".
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| Sealant After Placement -
In hot climates the sealant will remain sticky for a few hours.
If traffic must flow
before proper curing, place a light film of sand over the crack sealant or use a de-tacking product like Glenzoil.
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| How much Sealant will I need? -
This obviously varies according to the depth and width of the cracks since
the crack sealant is displacing the empty volume of the crack.
An average crack is 1/2" by 1/2". The rate for this
size of crack is 0.18 lbs/foot or a 50 lb block will fill 275 feet.
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APPROXIMATE COVERAGE CHART
FOR CRACKSEALING |
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Depth |
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Pound/100 lineal ft. |
| 3/8" |
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3/8" |
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6.9 |
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1/2" |
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9.3 |
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1/2" |
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12.3 |
| 1/2" |
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1" |
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24.7 |
| 3/4" |
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1/2" |
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18.5 |
| 3/4" |
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3/4" |
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27.8 | | |
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| Make
your jobs better than your competitors! |
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1. Drying Times |
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Nothing is more critical to a good sealcoating job and yet more abused than the time of drying between coats and the time of dryng before traffic is allowed. Improper dry
times lead to a bluish tint on the sealer, premature wear, excessive tire marking, tracking, and shoe pickup.
As contractors we are always in a hurry to finish; however, the
sealer can only perform well when used properly. You must allow adequate dry times between coats. The water must leave the 1st coat in order for proper curing. If a
second coat is applied while the coating is tacky, the water from the 1st coat is trapped. Trapped water leads to a soft coating and to
the blue coloring some experience
during hot, humid days. As a rule of thumb, we would go to second coat/second day rule when temperatures exceed 90F and humidity exceeds 70%. After the second coat
is finished, try to get as much drying time as possible before traffic is allowed on the surface. Require 24 hours if you warranty your work. 2 - 4,000 pound vehicles will tear
up any coating if not allowed to properly cure. You’re asking too much out of the coating to accept less cure time. We do realize that
in this day and age, many property owners
won’t allow this time. You must explain the consequences so the property owner understands the coatings’ limitations and that his decision of allowig traffic too soon will
hurt the performance and longevity of the sealer. |
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2. Cooling the Surface before application |
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Most do not even attempt to cool the surface before application. However, when the coating hits a hot pavement it can actually dry too
fast. The coating should be formed
in a well organized manner so that all the particles form an interlocking network,
which gives it strength. When the surface is too hot, the coating is formed too quickly
when water flash evaporates. The organized coating formation is now a chaotic formation and the interlocking does not occur, thus a
weakened coating. A fog coat of water
should be applied to the surface
on hot (greater than 80 F) to cool the surface. |
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3. Be Neat |
| Finish the job with absolute
neatness.
At the end of the driveway or the entrance where you are finishing up, string a line between the sides. Trim up to the string line for a
neat finish. Cover cars, sidewalks, bushes, garage doors, etc. before spraying, especially when the wind is strong. Watch where you
are stepping at all times. |
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