Skylight crack fix?

Thanks....called my RV dealer and he said use putty tape between the skylight / roof and Dicor on top.

I’m finding several posts stating Dicor is not compatible with polycarbonate (Lexan). I’ll call Dicor to confirm compatibility.

My replacement came with a tube of butyl caulk. Use that between the skylight and the roof, dicor over the screws and edges just like factory. Try to avoid making a dam between the dome and the dicor. Fill it so it all slopes to drain.

Stop drill the crack with a #40 drill than rough up the area of the crack inside and out side and paint on some clear epoxy.Did one 12 yrs ago and still holding on no leaks.

I would go with Dicor its easy to install and easy to remove in a few years to reseal as it ages. Others may last a bit longer but are a real pain to remove as they age and they will. The harder it is to get the old stuff off the more risk of damage to roof or skylight.

Thanks everyone to the great advice and responses. Took a closer look today……found lots fractures “thinking about” becoming cracks on both of my skylights. So I now plan to replace both.

Replacement looks straight foreword – thanks for the link to EZ Tops.

Any recommendation on the best sealant? I have the typical rubber EPDM roof – I’m thinking Dicor lap sealant.

Here is what I did for a short term fix until a new dome can be ordered. Did this in the camp ground this spring. I was "in the bath room" and hear drip, drip... oh no, what??? I was lucky the snow on the roof had just started to melt and I found it before any inside damage came. This dome crack can make a mess if it is leaking for 4 months with the camper in winter storage. I also carry spare Eternabond and other items to fix these mini diasters on the spot.

The offender...


Cleaned it and stop drilled


Put Eternabond on the outside




Went inside and put EB there too.




Here is an alternate place to the EZ tops. Icon Direct out of Canada. I have been pleased with the quality I have bought from them. Bought my replacement AC shroud. The shower top is still to come.
http://www.icondirect.com/skylights/

Good luck and hope this helps

John

PS. I also spray the dome with 303 UV protectant and all other plastic items up there each time I wash the roof. About 4 - 5 times a year. The sun is a killer on anything plastic up there. The 303 really helps

Drilled both ends of crack, mixed up some fibreglass resin and applied one coat, then covered with fibre glass cloth and two more coats of resin. Still good after a few years.

I had cracks in the corners. I filled them with dicor. Lasted for awhile then I bumped into it by mistake and it disintegrated. I replaced the dome. 3.5 hours to remove and remove all the sealant and butyl caulk, 20 min to install and reseal. 3 Ibuprofen that evening.

You can buy acrylic adhesive and the application tips at True Value hardware. The adhesive flows into the crack and solvent welds the two pieces together.

The bad news is that acrylic becomes brittle with UV and the only guarantee is that it will crack again.....and again.....and (you get the drift?).

I stop drilled the crack and covered it with a small strip of Eternabond.
It's been several years and no problems.
The patch cannot be seen from the ground.
It's quick and easy. But, replacing the skylight would be he best repair.