Paving Sealant - Additional Coats?

[twixx]

Had the driveway sealed in Covid by a local firm who were expensive, and the job rather poor (I feel). I've just cleaned and re-sanded the driveway myself. I'm not a pro, and the job looks OK.

Having been put off by sealing from the experience of the first time, I decided what the H and just went for it.

I applied a coat of Sika Patio Seal, and it looks fine. The £60 and a few hours I've spent certainly look value for money when I consider the £1000 I paid during Covid, and wasn't overly impressed with it. If its £60 and a few hours a year thats required, then fine I guess...

Anyway, the Sika sealant says apply a second coat within 2 hours. Naively and due to not being a pro, I only bought one tub of 5L seal, so don't have enough for a second coat. What is the science/reason behind this 2 hour specification? What will happen if I apply a second coat tomorrow?

My head is saying, surely nothing "bad" is going to occur?

 

[freddiemercurystwin]

Ring up Sika and ask to speak to their technical department, they deal with these kinds of queries all day long. 01707 394 444

 

[twixx]

Appreciate the reply, but less hassle to put a second coat down tomorrow.

 

[foxhole]

Likely it may not bind with 1st coat well.

 

[freddiemercurystwin]

It's OK, they just write that blur on the back for a laugh.

 

[jj4091]

Was it water based or spirit based. If it is the former then it will not ahere very well to the first coat. If it is a spirit based one it will soften and reactivate the first coat and adhere without a problem.

 

[twixx]

Water based. And based on feedback from above/elsewhere, it seems as though binding is the issue, resulting in PVA type layers, which might just peel away.

Which is fine, now I understand. Thats the answer I was after.