Sealant/Wax fading off of roof first? normal?

A

AuAltima3.5

New member
This isn't really a huge deal to me, but I have noticed that just about any car I have cleaned, the horizontal surfaces (most notably the roof) "lose" wax or sealant sooner (like P21s or KSG).



I used some KSG on the roof of my Nissan about 2-3 weeks ago, and I can already tell that it is weakening faster than the rest of the car. The beads aren't as tight.



Anyone one else notice this on other cars?



EDIT: all parts of the car get the same treatment - wash, clay, polish or AIO, the sealant.
 
I hate to be sarcastic (no, I do not), but GEE, WHOULDA THUNK THAT? Oh my God! Why would the wax last for a shorter period of time on horizontal surfaces? Could it be that horizontal surfaces get more exposure to the sun? Nah. Could it be that horizontal surfaces are more exposed to rain? No, what would that have to do with it??? Could it be that horizontal surfaces are more exposed to tree sap, industial fallout and bird crap? Nooooo... The fact that horizontal surfaces accumilate more crap than vertical surfaces on a vehicle as evidenced by the amount of claying required is pure cooincidence, right??:nixweiss



:wall :wall :wall
 
Not quite that simple IMO. I'd say it depends on what the vehicle in question goes through. With all of ours all being garaged these days, the roof is usually the *last* panel for LSP failure, sometimes by a huge margin (i.e., not just a few weeks).
 
STG said:
I hate to be sarcastic (no, I do not), but GEE, WHOULDA THUNK THAT? Oh my God! Why would the wax last for a shorter period of time on horizontal surfaces? Could it be that horizontal surfaces get more exposure to the sun? Nah. Could it be that horizontal surfaces are more exposed to rain? No, what would that have to do with it??? Could it be that horizontal surfaces are more exposed to tree sap, industial fallout and bird crap? Nooooo... The fact that horizontal surfaces accumilate more crap than vertical surfaces on a vehicle as evidenced by the amount of claying required is pure cooincidence, right??:nixweiss



:wall :wall :wall
Click to expand...



Totally without taste but totally correct.:chuckle:
 
STG said:
I hate to be sarcastic (no, I do not), but GEE, WHOULDA THUNK THAT? Oh my God! Why would the wax last for a shorter period of time on horizontal surfaces? Could it be that horizontal surfaces get more exposure to the sun? Nah. Could it be that horizontal surfaces are more exposed to rain? No, what would that have to do with it??? Could it be that horizontal surfaces are more exposed to tree sap, industial fallout and bird crap? Nooooo... The fact that horizontal surfaces accumilate more crap than vertical surfaces on a vehicle as evidenced by the amount of claying required is pure cooincidence, right??:nixweiss



:wall :wall :wall
Click to expand...



Hope you aren't a father to anyone... Happy Father's Day if you are, I am sure it was a classy arrangement.
 
i find that the hood wears out first...simply due to it getting the most abuse from rain, bugs, etc.



horizontal panels definitely take the most beating from sun exposure as well. i can see where waxes would suffer the most from this, but sealants also fail more quickly on them. areas like side windows seem to last forever (RainX)...very little abuse to them.



.02
 
STG said:
I hate to be sarcastic (no, I do not), but GEE, WHOULDA THUNK THAT? Oh my God! Why would the wax last for a shorter period of time on horizontal surfaces? Could it be that horizontal surfaces get more exposure to the sun? Nah. Could it be that horizontal surfaces are more exposed to rain? No, what would that have to do with it??? Could it be that horizontal surfaces are more exposed to tree sap, industial fallout and bird crap? Nooooo... The fact that horizontal surfaces accumilate more crap than vertical surfaces on a vehicle as evidenced by the amount of claying required is pure cooincidence, right??:nixweiss



:wall :wall :wall
Click to expand...



While your statements do have some merit they are a generalization and therefore aren't complete. Poorly buffered(acidic) precipitation is harder on flat surfaces as is extreme summer heat. During the winter months road salt affects the lower portions of the vehicle often causing product failure and contaminant bonding much faster than on top sections.
 
I'd have to say the heat from the engine has a major effect on protection. Is it fair to say that sealants are less likely to break down from engine/hood heat compared to carnubas because of the oils?
 
Accumulator said:
Not quite that simple IMO. I'd say it depends on what the vehicle in question goes through. With all of ours all being garaged these days, the roof is usually the *last* panel for LSP failure, sometimes by a huge margin (i.e., not just a few weeks).
Click to expand...



I agree 100%, usually the roof stays the cleanest on out cars and the LSP seems to last the longest time there also. The sides, esp lower halves get the most beating esp in the winter and when it rains. Sun, heat and UV rays aren't a big problem here and the cars are garaged most of the time. But the situation may be different if I parked under trees in a hot climate.
 
Those who mentioned the hood going first- that can be *very* true for some applications. The Souveran I use on the Jag hardly lasts any time at all on the hood due to engine heat; I have to redo it all the time while the rest of the car stays fine for a long time.
 
David Fermani said:
I'd have to say the heat from the engine has a major effect on protection. Is it fair to say that sealants are less likely to break down from engine/hood heat compared to carnubas because of the oils?
Click to expand...



I totally agree with you. I've also noticed that in my suv. I think heat is a big factor in regards of sealants durability. I just put another layer of sealant in every other wash.
 
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