Can you caulk over old caulk on RV

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The application of the caulk might be a necessity for your RV. However, when you try to apply the caulk, you have to first answer to your question, can you caulk over old caulk on RV?

We will answer this question today and help you understand how you should go about caulking your RV.

Can you caulk over old caulk on RV?

Yes, in most cases, you can caulk over old caulk on your RV. For example, when dealing with a crack on the sidewall of your RV, you can undoubtedly caulk over old caulk on your RV. Even if the old caulk has developed a crack, you can still apply the new caulk over the old caulk on your RV.

There are, however, a few cases in which this is not possible. We will cover these cases below.

In which cases you shouldn’t caulk over the old one?

When dealing with the roof of your RV or the window frame, or if the old caulk is flaky, it does not make any sense to apply the new caulk over the older caulk. We will go into the details of all these three conditions below.

1. When dealing with roof:

One of the main reasons you might apply the caulk on your RV’s roof is to prevent any kind of leakage. Over a while, the old caulk can develop cracks. In that case, if you apply the new caulk over the old caulk, it might still not protect you against water and other weather conditions completely. That is because the older caulk will always be detrimental to the integrity of the newer ones.

When dealing with the roof, it is always a good idea to remove the old caulk altogether. After that, you have to apply the newer one to ensure that the water does not percolate through.

2. When dealing with window frame:

There are a couple of reasons why you might apply caulk over the window frame of your RV. The first one, of course, is to prevent any water percolation into the RV. If the water percolation is inside the RV through the window frame, it can damage the appliances and the interiors of your RV.

Another case in which you might apply caulk to the window frame is to ensure that the rattling of the window panes stop.

In both these cases, if the older caulk has developed the cracks and you apply the newer one over it, the purpose will not be served. You cannot be hundred percent sure that water will not percolate through.

The right caulk also means that you will not be able to secure the window panes completely.

That is why, once again, it makes sense to remove the old caulk and apply the newer one when dealing with the window frame.

3. If old caulk seems to be flaky:

The effectiveness of the caulk is always dependent on its structural integrity. Over time, it can develop not only cracks but also become flaky as well. If you apply the new caulk over the older one, which is flaky, sooner than later, the newer one might come off as well. In that case, the effort, as well as the caulk which you have used, might not serve you well.

If you notice that the older caulk is flaky, a much better approach is to remove the older caulk and apply the newer one.

In most cases, you can caulk over old caulk on your RV. However, there are 3 distinct exceptions to this rule. Once you follow our guide above, you will know how to proceed towards caulking your RV right away.