Dicor Lap Sealant Cure Time

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The Dicor lap sealant is a commonly used adhesive product. It can form a seal around two objects that need one.

It includes sealing air vents, AC units, and air pipes fittings, along with inside screw holes too.

It is also used to cover a gap or hole to some degree, though its suitability for this purpose is more limited.

For wide holes or gaps, a patch is a better solution – like on an RV roof – with lap sealant used around the patch to ensure a complete seal is achieved.

Dicor Self Leveling Lap Sealant Drying Time

When it comes to the Dicor lap sealant cure time, there is a layered timeline to this, rather than a single one.

Their lap sealant has petroleum distillates present in the solution. These assist in the curing process with their presence reducing as the process continues.

Once the lap sealant is completely cured, the petroleum distillates disappear.

This is a good thing because no one wants petroleum-based products near their motorhome or trailer for long durations.

Dicor Lap Sealant Cure Time

Applying the Lap Sealant at a reasonable temperature is sensible. Best results are achieved at a Dicor lap sealant application temperature of between 49° F and around 72° F.

Any outdoor temperature significantly above or below the above temperature range can change the curing time or reduce the sealant’s effectiveness.

Lower temperatures may prevent the self-leveling feature from working properly too.

The tube of lap sealant can be applied and forms a skin over the application surface within 5+ minutes, depending on conditions.

When and where the sealant is applied is relevant because it won’t be waterproof for at least 4 hours and possibly longer than this with temperature variances.

Ideally, the RV should be under a cover protected from the rain when using this sealant. Avoid driving it if you can too. This might not always be possible, but it will offer the best outcome.

The Dicor sealant is usable on different surfaces, including TPO and rubber roofs without causing damage to them. It’s more commonly used for roof repairs, but it also can seal up old screw holes, form a seal for new appliances or vents on the roof, etc.

With the Dicor lap sealant dry time, allow up to two days for the cure to set to an 80 percent level.


Bear in mind that the final curing will only be completed after approximately a month.

This timeline may differ should the material get rained on during the curing process, or before it is waterproofed.

Dicor Self-Leveling Lap Sealant – 501LSW-1 (4 Pack)

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Do Thicker Layers or Repeated Application Slow Curing Times?

In some repair situations, a decision may be made to apply the Dicor lap sealant more liberally.

Alternatively, adding multiple layers in several applications over a few hours is another possibility too.

How Does Either Situation Above Alter Curing Times?

The information varies for Dicor sealant depending on how much thicker it was applied.

The curing process won’t need that much additional time, however, waterproofing and the curing process are going to be extended somewhat. This is inevitable.

How to Apply Dicor Lap Sealant

The Dicor lap sealant product works similar to caulking, and yet it’s not made from silicone. Because of this, it’s unsuited for vertical applications.

This is why using it on the roof works so well and its use on walls is not advisable.

Despite not being made from silicone, it can be applied similarly to caulking.

Dicor Lap Sealant Instructions for How to Apply the Dicor Lap Sealant

  1. Clear away any dirt, debris, rust, etc.
  2. Use an alcohol wipe. The sealant needs a clean surface to work best.
  3. Ensure the surface is now bone dry. If it’s rained recently, allow time for the surrounding area to dry out fully or the cure won’t be strong enough.
  4. Lay down painter’s tape (or something similar) around the edge of the area. This protects the RV’s surfaces where you don’t want sealant to be applied.
  5. Apply the lap sealant over the necessary area.
  6. Remove the painter’s tape and any excess quickly, within minutes of application.

Once the Dicor Lap Sealant has been applied, it’s important not to fuss with it. Smoothing it out excessively will only delay the curing process.

It may also affect the waterproofing aspect in the early hours following the first application.

Dicor Self-Leveling Lap Sealant – 501LSW-1 (4 Pack)

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How Do You Smooth Out Dicor Lap Sealant?

Per the instructions on how to apply Dicor, a painter’s tape around the area is beneficial to avoid it going where you don’t want it to go.

With the painter’s tape in place, apply the lap sealant and then we’d suggest using a spoon to smooth it out where self-leveling will be insufficient.

While it’s a little unconventional, a spoon is small enough to get into the smaller spaces. Also, everyone is familiar with how to hold a spoon steady too! This helps.

Smooth out the lap sealant slowly and be careful to obtain the best results here. It also requires getting a knack for it, so you’ll improve as you go.

Can You Put Lap Sealant Over Old Sealant?

Yes, it’s entirely possible to put Dicor on top of Dicor. Don’t be put off from adding new Dicor sealant over the top of the existing product previously applied.

Follow the same instructions above to do so.

Also, just because the Dicor sealant has been previously used doesn’t negate the need to clean its surface completely before applying a new layer. Otherwise, it will have trouble creating a proper cure too.

Can Dicor Be Painted?

No, it cannot.

The best you can do in terms of color and appearance is to smooth it out and to select the right color of Dicor sealant that you prefer.

Dicor Lap Sealant Bubbling

The bubbling is created because when applied over a rubber roof membrane, the membrane may stretch and shift in position post-application.  

There is nothing to be done to prevent this from happening. In most situations, the bubbling will reduce in size over a few weeks.

Read Also: How Often Should You Seal Your RV Roof?

Does Dicor Expire?

No product lasts forever. Keeping a tube of Dicor on hand is very useful when off-grid and suddenly having a roofing or other issue to fix.

How long does Dicor Lap Sealant last? For a tube of Dicor sealant that hasn’t been previously opened, it should be expected to last 3 years. It may last up to five years.

It’s a good idea to keep your receipts for the purchase nearby, so you know how long it’s been since it was purchased.

What is Dicor Lap Sealant Used For?

Dicor is used for sealing up horizontal surfaces in the RV and van life communities.

Most commonly, appliances installed or added to the roof need to be sealed and weatherproofed.

This includes solar panel installations, air vents, AC units, vent covers, skylight covers, around and inside screw holes, and along roof edges to provide a proper seal.

Dicor Lap Sealant can create a strong seal on various materials including metal, wood, aluminum, and TPO or rubber membranes.

When adding new AC units, for instance, they may differ in size. This will involve drilling new screw holes in the roof for the fitting and vacating previously used holes. It’ll leave unused holes to cover over and seal up.

Additionally, the AC unit will have new screw holes that can be sealed over. Also, all along the fitting between the roof and the AC unit will need a self-leveling lap sealant to form a highly effective seal to avoid water leakage.

Read Also: Can I Use Flex Seal on My RV Roof?

How to Remove Dicor Lap Sealant?

There are various approaches to removing the Dicor lap sealant after it’s been sealing your RV for a few months or years.

Here are a few of the ways for how to remove Dicor Lap Sealant:

1. Putty Knife

A putty knife can act as a scraper to remove much of what is present. It won’t get it all and it won’t be the neatest job ever, but it’ll get most of it off.

2. Heat Gun

A heat gun can warm up the sealant removing the curing effect.

Once the lap sealant is no longer hardened, it is easier to use the putty knife to remove it completely.

The issue with applying heat is usually you’re doing something on the roof. It if has a rubber or TPO membrane covering it, then it’s easy to accidentally burn through the membrane at the same time. Therefore, some people may prefer the third approach…

3. Mineral Spirits

Denatured mineral spirits can handle the bits of lap sealant remaining after trying other approaches.

The spirits will have an odor to them, usually. Use a clean rag or a brush to cover the old lap sealant with mineral spirits.

How to Remove Dicor Lap Sealant from Fiberglass?

It’s advisable to try using a scraper or a putty knife first to remove the easiest parts of the sealant from the fiberglass. This is the best way to begin removing any lap sealant for fiberglass roof owners. Then see what you’re left with.

A solvent like mineral spirits (denatured) is successful on fiberglass surfaces. Alternatively, acetone is another option to try if there are still remnants of sealant remaining.

Removing lap sealant from fiberglass is a time-consuming process, but it can be done.

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